398871937 has 4 divisors (see below), whose sum is σ = 398912836. Its totient is φ = 398831040.

The previous prime is 398871859. The next prime is 398871943. The reversal of 398871937 is 739178893.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 739178893 = 383 ⋅1929971.

It can be written as a sum of positive squares in 2 ways, for example, as 92236816 + 306635121 = 9604^2 + 17511^2 .

It is a cyclic number.

It is not a de Polignac number, because 398871937 - 2²³ = 390483329 is a prime.

It is a super-2 number, since 2×398871937² = 318197644252263938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398875937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3637 + ... + 28477.

It is an arithmetic number, because the mean of its divisors is an integer number (99728209).

Almost surely, 2^398871937 is an apocalyptic number.

It is an amenable number.

398871937 is a deficient number, since it is larger than the sum of its proper divisors (40899).

398871937 is a wasteful number, since it uses less digits than its factorization.

398871937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40898.

The product of its digits is 2286144, while the sum is 55.

The square root of 398871937 is about 19971.7785136928. The cubic root of 398871937 is about 736.1130109872.

The spelling of 398871937 in words is "three hundred ninety-eight million, eight hundred seventy-one thousand, nine hundred thirty-seven".