398757961 has 8 divisors (see below), whose sum is σ = 457732800. Its totient is φ = 340285488.

The previous prime is 398757941. The next prime is 398757973. The reversal of 398757961 is 169757893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398757961 - 2⁷ = 398757833 is a prime.

It is a super-2 number, since 2×398757961² = 318015822921755042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (398757911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123886 + ... + 127063.

It is an arithmetic number, because the mean of its divisors is an integer number (57216600).

Almost surely, 2^398757961 is an apocalyptic number.

It is an amenable number.

398757961 is a deficient number, since it is larger than the sum of its proper divisors (58974839).

398757961 is a wasteful number, since it uses less digits than its factorization.

398757961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251183.

The product of its digits is 2857680, while the sum is 55.

The square root of 398757961 is about 19968.9248834283. The cubic root of 398757961 is about 736.0428905623.

The spelling of 398757961 in words is "three hundred ninety-eight million, seven hundred fifty-seven thousand, nine hundred sixty-one".