231406404 has 24 divisors (see below), whose sum is σ = 563424960. Its totient is φ = 73781664.

The previous prime is 231406379. The next prime is 231406429. The reversal of 231406404 is 404604132.

It is an interprime number because it is at equal distance from previous prime (231406379) and next prime (231406429).

It is a super-2 number, since 2×231406404² = 107097847624422432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418939 + ... + 419490.

It is an arithmetic number, because the mean of its divisors is an integer number (23476040).

Almost surely, 2^231406404 is an apocalyptic number.

It is an amenable number.

231406404 is an abundant number, since it is smaller than the sum of its proper divisors (332018556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231406404 is a wasteful number, since it uses less digits than its factorization.

231406404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838459 (or 838457 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 231406404 is about 15212.0479883545. The cubic root of 231406404 is about 613.9388615220.

The spelling of 231406404 in words is "two hundred thirty-one million, four hundred six thousand, four hundred four".