1399760 has 20 divisors (see below), whose sum is σ = 3254628. Its totient is φ = 559872.

The previous prime is 1399751. The next prime is 1399777. The reversal of 1399760 is 679931.

It can be written as a sum of positive squares in 2 ways, for example, as 163216 + 1236544 = 404^2 + 1112^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1399760.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8669 + ... + 8828.

2^1399760 is an apocalyptic number.

1399760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1399760 is an abundant number, since it is smaller than the sum of its proper divisors (1854868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1399760 is a wasteful number, since it uses less digits than its factorization.

1399760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17510 (or 17504 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 1399760 is about 1183.1145337625. The cubic root of 1399760 is about 111.8625013346.

The spelling of 1399760 in words is "one million, three hundred ninety-nine thousand, seven hundred sixty".