23415540 has 48 divisors (see below), whose sum is σ = 67683840. Its totient is φ = 6042240.

The previous prime is 23415533. The next prime is 23415563. The reversal of 23415540 is 4551432.

It is a self number, because there is not a number n which added to its sum of digits gives 23415540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4435 + ... + 8154.

It is an arithmetic number, because the mean of its divisors is an integer number (1410080).

Almost surely, 2^23415540 is an apocalyptic number.

23415540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23415540 is an abundant number, since it is smaller than the sum of its proper divisors (44268300).

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

23415540 is a wasteful number, since it uses less digits than its factorization.

23415540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12632 (or 12630 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 23415540 is about 4838.9606322019. The cubic root of 23415540 is about 286.0891534208.

Adding to 23415540 its reverse (4551432), we get a palindrome (27966972).

The spelling of 23415540 in words is "twenty-three million, four hundred fifteen thousand, five hundred forty".