399765905378 has 32 divisors (see below), whose sum is σ = 686179676160. Its totient is φ = 171111704400.

The previous prime is 399765905369. The next prime is 399765905387. The reversal of 399765905378 is 873509567993.

It is an interprime number because it is at equal distance from previous prime (399765905369) and next prime (399765905387).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75724943 + ... + 75730221.

It is an arithmetic number, because the mean of its divisors is an integer number (21443114880).

Almost surely, 2^399765905378 is an apocalyptic number.

399765905378 is a deficient number, since it is larger than the sum of its proper divisors (286413770782).

399765905378 is a wasteful number, since it uses less digits than its factorization.

399765905378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11102.

The product of its (nonzero) digits is 385786800, while the sum is 71.

The spelling of 399765905378 in words is "three hundred ninety-nine billion, seven hundred sixty-five million, nine hundred five thousand, three hundred seventy-eight".