23215440 has 40 divisors (see below), whose sum is σ = 71968608. Its totient is φ = 6190720.

The previous prime is 23215403. The next prime is 23215459. The reversal of 23215440 is 4451232.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 48126 + ... + 48605.

Almost surely, 2^23215440 is an apocalyptic number.

23215440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23215440 is an abundant number, since it is smaller than the sum of its proper divisors (48753168).

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

23215440 is a wasteful number, since it uses less digits than its factorization.

23215440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96747 (or 96741 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 23215440 is about 4818.2403426977. The cubic root of 23215440 is about 285.2718858179.

Adding to 23215440 its reverse (4451232), we get a palindrome (27666672).

The spelling of 23215440 in words is "twenty-three million, two hundred fifteen thousand, four hundred forty".