1399073760 has 144 divisors (see below), whose sum is σ = 5456426976. Its totient is φ = 319785984.

The previous prime is 1399073737. The next prime is 1399073761. The reversal of 1399073760 is 673709931.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399073761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59319 + ... + 79478.

It is an arithmetic number, because the mean of its divisors is an integer number (37891854).

Almost surely, 2^1399073760 is an apocalyptic number.

1399073760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1399073760 is an abundant number, since it is smaller than the sum of its proper divisors (4057353216).

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

1399073760 is a wasteful number, since it uses less digits than its factorization.

1399073760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138825 (or 138814 counting only the distinct ones).

The product of its (nonzero) digits is 214326, while the sum is 45.

The square root of 1399073760 is about 37404.1944172041. The cubic root of 1399073760 is about 1118.4421794526.

The spelling of 1399073760 in words is "one billion, three hundred ninety-nine million, seventy-three thousand, seven hundred sixty".