18725240 has 32 divisors (see below), whose sum is σ = 43493760. Its totient is φ = 7248000.

The previous prime is 18725237. The next prime is 18725249. The reversal of 18725240 is 4252781.

It is a super-2 number, since 2×18725240² = 701269226115200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18725249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6311 + ... + 8790.

It is an arithmetic number, because the mean of its divisors is an integer number (1359180).

Almost surely, 2^18725240 is an apocalyptic number.

18725240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18725240 is an abundant number, since it is smaller than the sum of its proper divisors (24768520).

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

18725240 is a wasteful number, since it uses less digits than its factorization.

18725240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15143 (or 15139 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 18725240 is about 4327.2670359015. The cubic root of 18725240 is about 265.5476511117.

The spelling of 18725240 in words is "eighteen million, seven hundred twenty-five thousand, two hundred forty".