231801440 has 48 divisors (see below), whose sum is σ = 589761648. Its totient is φ = 85587456.

The previous prime is 231801419. The next prime is 231801457. The reversal of 231801440 is 44108132.

It is a congruent number.

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, 53642 + ... + 57801.

It is an arithmetic number, because the mean of its divisors is an integer number (12286701).

Almost surely, 2^231801440 is an apocalyptic number.

231801440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231801440 is an abundant number, since it is smaller than the sum of its proper divisors (357960208).

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

231801440 is a wasteful number, since it uses less digits than its factorization.

231801440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111471 (or 111463 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 231801440 is about 15225.0267651653. The cubic root of 231801440 is about 614.2880164739.

Adding to 231801440 its reverse (44108132), we get a palindrome (275909572).

The spelling of 231801440 in words is "two hundred thirty-one million, eight hundred one thousand, four hundred forty".