231343400440 has 64 divisors (see below), whose sum is σ = 563958948960. Its totient is φ = 85068533760.

The previous prime is 231343400333. The next prime is 231343400489. The reversal of 231343400440 is 44004343132.

It is a junction number, because it is equal to n+sod(n) for n = 231343400399 and 231343400408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3926701 + ... + 3985180.

Almost surely, 2^231343400440 is an apocalyptic number.

231343400440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231343400440 is an abundant number, since it is smaller than the sum of its proper divisors (332615548520).

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

231343400440 is a wasteful number, since it uses less digits than its factorization.

231343400440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7911952 (or 7911948 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 231343400440 its reverse (44004343132), we get a palindrome (275347743572).

The spelling of 231343400440 in words is "two hundred thirty-one billion, three hundred forty-three million, four hundred thousand, four hundred forty".