231002440 has 16 divisors (see below), whose sum is σ = 519755580. Its totient is φ = 92400960.

The previous prime is 231002417. The next prime is 231002489. The reversal of 231002440 is 44200132.

It can be written as a sum of positive squares in 2 ways, for example, as 217208644 + 13793796 = 14738^2 + 3714^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2887491 + ... + 2887570.

Almost surely, 2^231002440 is an apocalyptic number.

231002440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231002440 is an abundant number, since it is smaller than the sum of its proper divisors (288753140).

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

231002440 is a wasteful number, since it uses less digits than its factorization.

231002440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5775072 (or 5775068 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 231002440 is about 15198.7644234655. The cubic root of 231002440 is about 613.5814043242.

Adding to 231002440 its reverse (44200132), we get a palindrome (275202572).

The spelling of 231002440 in words is "two hundred thirty-one million, two thousand, four hundred forty".