22512540 has 24 divisors (see below), whose sum is σ = 63035280. Its totient is φ = 6003328.

The previous prime is 22512527. The next prime is 22512557. The reversal of 22512540 is 4521522.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 187545 + ... + 187664.

It is an arithmetic number, because the mean of its divisors is an integer number (2626470).

Almost surely, 2^22512540 is an apocalyptic number.

22512540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22512540 is an abundant number, since it is smaller than the sum of its proper divisors (40522740).

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

22512540 is a wasteful number, since it uses less digits than its factorization.

22512540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375221 (or 375219 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 22512540 is about 4744.7381381906. The cubic root of 22512540 is about 282.3632459985.

It can be divided in two parts, 225 and 12540, that multiplied together give a triangular number (2821500 = T₂₃₇₅).

The spelling of 22512540 in words is "twenty-two million, five hundred twelve thousand, five hundred forty".