23155240 has 16 divisors (see below), whose sum is σ = 52099380. Its totient is φ = 9262080.

The previous prime is 23155217. The next prime is 23155247. The reversal of 23155240 is 4255132.

It can be written as a sum of positive squares in 2 ways, for example, as 21178404 + 1976836 = 4602^2 + 1406^2 .

It is not an unprimeable number, because it can be changed into a prime (23155247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289401 + ... + 289480.

Almost surely, 2^23155240 is an apocalyptic number.

23155240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23155240 is an abundant number, since it is smaller than the sum of its proper divisors (28944140).

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

23155240 is a wasteful number, since it uses less digits than its factorization.

23155240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578892 (or 578888 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 23155240 is about 4811.9891936703. The cubic root of 23155240 is about 285.0250926917.

The spelling of 23155240 in words is "twenty-three million, one hundred fifty-five thousand, two hundred forty".