18425140 has 12 divisors (see below), whose sum is σ = 38692836. Its totient is φ = 7370048.

The previous prime is 18425137. The next prime is 18425159. The reversal of 18425140 is 4152481.

It can be written as a sum of positive squares in 2 ways, for example, as 3587236 + 14837904 = 1894^2 + 3852^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460609 + ... + 460648.

It is an arithmetic number, because the mean of its divisors is an integer number (3224403).

Almost surely, 2^18425140 is an apocalyptic number.

18425140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18425140 is an abundant number, since it is smaller than the sum of its proper divisors (20267696).

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

18425140 is a wasteful number, since it uses less digits than its factorization.

18425140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921266 (or 921264 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 18425140 is about 4292.4515139952. The cubic root of 18425140 is about 264.1214049816.

The spelling of 18425140 in words is "eighteen million, four hundred twenty-five thousand, one hundred forty".