398057831 has 8 divisors (see below), whose sum is σ = 403878384. Its totient is φ = 392247360.

The previous prime is 398057819. The next prime is 398057843. The reversal of 398057831 is 138750893.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (398057819) and next prime (398057843).

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 398057831 - 2¹⁰ = 398056807 is a prime.

It is a super-2 number, since 2×398057831² = 316900073640849122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398057131) 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, 117836 + ... + 121166.

It is an arithmetic number, because the mean of its divisors is an integer number (50484798).

Almost surely, 2^398057831 is an apocalyptic number.

398057831 is a deficient number, since it is larger than the sum of its proper divisors (5820553).

398057831 is a wasteful number, since it uses less digits than its factorization.

398057831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5041.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 398057831 is about 19951.3866936612. The cubic root of 398057831 is about 735.6118625094.

The spelling of 398057831 in words is "three hundred ninety-eight million, fifty-seven thousand, eight hundred thirty-one".