23131040 has 24 divisors (see below), whose sum is σ = 54647460. Its totient is φ = 9252352.

The previous prime is 23131027. The next prime is 23131057. The reversal of 23131040 is 4013132.

It can be written as a sum of positive squares in 2 ways, for example, as 21270544 + 1860496 = 4612^2 + 1364^2 .

It is a super-2 number, since 2×23131040² = 1070090022963200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72125 + ... + 72444.

Almost surely, 2^23131040 is an apocalyptic number.

23131040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23131040 is an abundant number, since it is smaller than the sum of its proper divisors (31516420).

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

23131040 is a wasteful number, since it uses less digits than its factorization.

23131040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144584 (or 144576 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 23131040 is about 4809.4739837117. The cubic root of 23131040 is about 284.9257629563.

Adding to 23131040 its reverse (4013132), we get a palindrome (27144172).

The spelling of 23131040 in words is "twenty-three million, one hundred thirty-one thousand, forty".