398226431 has 4 divisors (see below), whose sum is σ = 399429864. Its totient is φ = 397023000.

The previous prime is 398226427. The next prime is 398226443. The reversal of 398226431 is 134622893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398226431 - 2² = 398226427 is a prime.

It is a super-2 number, since 2×398226431² = 317168580693995522, 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 (398226421) 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, 601220 + ... + 601881.

It is an arithmetic number, because the mean of its divisors is an integer number (99857466).

Almost surely, 2^398226431 is an apocalyptic number.

398226431 is a deficient number, since it is larger than the sum of its proper divisors (1203433).

398226431 is a wasteful number, since it uses less digits than its factorization.

398226431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203432.

The product of its digits is 62208, while the sum is 38.

The square root of 398226431 is about 19955.6115165635. The cubic root of 398226431 is about 735.7157055895.

The spelling of 398226431 in words is "three hundred ninety-eight million, two hundred twenty-six thousand, four hundred thirty-one".