18125420 has 24 divisors (see below), whose sum is σ = 38459904. Its totient is φ = 7174656.

The previous prime is 18125413. The next prime is 18125431. The reversal of 18125420 is 2452181.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2732 + ... + 6611.

It is an arithmetic number, because the mean of its divisors is an integer number (1602496).

Almost surely, 2^18125420 is an apocalyptic number.

18125420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18125420 is an abundant number, since it is smaller than the sum of its proper divisors (20334484).

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

18125420 is a wasteful number, since it uses less digits than its factorization.

18125420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9449 (or 9447 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 18125420 is about 4257.3959176943. The cubic root of 18125420 is about 262.6814225808.

The spelling of 18125420 in words is "eighteen million, one hundred twenty-five thousand, four hundred twenty".