398631291 has 8 divisors (see below), whose sum is σ = 531610944. Its totient is φ = 265702920.

The previous prime is 398631281. The next prime is 398631301. The reversal of 398631291 is 192136893.

It is an interprime number because it is at equal distance from previous prime (398631281) and next prime (398631301).

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

It is not a de Polignac number, because 398631291 - 2⁶ = 398631227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398631221) 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, 12420 + ... + 30846.

It is an arithmetic number, because the mean of its divisors is an integer number (66451368).

Almost surely, 2^398631291 is an apocalyptic number.

398631291 is a deficient number, since it is larger than the sum of its proper divisors (132979653).

398631291 is a wasteful number, since it uses less digits than its factorization.

398631291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25641.

The product of its digits is 69984, while the sum is 42.

The square root of 398631291 is about 19965.7529534951. The cubic root of 398631291 is about 735.9649448440.

The spelling of 398631291 in words is "three hundred ninety-eight million, six hundred thirty-one thousand, two hundred ninety-one".