231015440 has 20 divisors (see below), whose sum is σ = 537111084. Its totient is φ = 92406144.

The previous prime is 231015437. The next prime is 231015451. The reversal of 231015440 is 44510132.

231015440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 177315856 + 53699584 = 13316^2 + 7328^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 1443767 + ... + 1443926.

Almost surely, 2^231015440 is an apocalyptic number.

231015440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231015440 is an abundant number, since it is smaller than the sum of its proper divisors (306095644).

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

231015440 is a wasteful number, since it uses less digits than its factorization.

231015440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2887706 (or 2887700 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 231015440 is about 15199.1920837918. The cubic root of 231015440 is about 613.5929141718.

Adding to 231015440 its reverse (44510132), we get a palindrome (275525572).

The spelling of 231015440 in words is "two hundred thirty-one million, fifteen thousand, four hundred forty".