1394720685 has 24 divisors (see below), whose sum is σ = 2419702584. Its totient is φ = 743178240.

The previous prime is 1394720671. The next prime is 1394720729. The reversal of 1394720685 is 5860274931.

1394720685 is digitally balanced in base 10, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 474629796 + 920090889 = 21786^2 + 30333^2 .

It is not a de Polignac number, because 1394720685 - 2⁷ = 1394720557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

1394720685 is strictly pandigital in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 1394720685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38445 + ... + 65325.

It is an arithmetic number, because the mean of its divisors is an integer number (100820941).

It is a 1-persistent number, because it is pandigital, but 2⋅1394720685 = 2789441370 is not.

It is a vampire number, since it can be written as 17295 ⋅ 80643 (with its own digits).

Almost surely, 2^1394720685 is an apocalyptic number.

1394720685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1394720685 is a deficient number, since it is larger than the sum of its proper divisors (1024981899).

1394720685 is a wasteful number, since it uses less digits than its factorization.

1394720685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28045 (or 28042 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 1394720685 is about 37345.9594199962. The cubic root of 1394720685 is about 1117.2810014827.

The spelling of 1394720685 in words is "one billion, three hundred ninety-four million, seven hundred twenty thousand, six hundred eighty-five".