18642500 has 30 divisors (see below), whose sum is σ = 40772886. Its totient is φ = 7456000.

The previous prime is 18642493. The next prime is 18642509. The reversal of 18642500 is 524681.

It can be written as a sum of positive squares in 5 ways, for example, as 9193024 + 9449476 = 3032^2 + 3074^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18642500.

It is not an unprimeable number, because it can be changed into a prime (18642509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1229 + ... + 6228.

Almost surely, 2^18642500 is an apocalyptic number.

18642500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18642500 is an abundant number, since it is smaller than the sum of its proper divisors (22130386).

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

18642500 is an equidigital number, since it uses as much as digits as its factorization.

18642500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7481 (or 7464 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 18642500 is about 4317.6961449366. The cubic root of 18642500 is about 265.1559542444.

The spelling of 18642500 in words is "eighteen million, six hundred forty-two thousand, five hundred".