1399908387 has 32 divisors (see below), whose sum is σ = 2024225280. Its totient is φ = 858574080.

The previous prime is 1399908331. The next prime is 1399908437. The reversal of 1399908387 is 7838099931.

It is not a de Polignac number, because 1399908387 - 2¹⁵ = 1399875619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1399908487) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 148818 + ... + 157944.

It is an arithmetic number, because the mean of its divisors is an integer number (63257040).

Almost surely, 2^1399908387 is an apocalyptic number.

1399908387 is a deficient number, since it is larger than the sum of its proper divisors (624316893).

1399908387 is a wasteful number, since it uses less digits than its factorization.

1399908387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9243.

The product of its (nonzero) digits is 2939328, while the sum is 57.

The square root of 1399908387 is about 37415.3496175032. The cubic root of 1399908387 is about 1118.6645400134.

The spelling of 1399908387 in words is "one billion, three hundred ninety-nine million, nine hundred eight thousand, three hundred eighty-seven".