18536421 has 8 divisors (see below), whose sum is σ = 25084384. Its totient is φ = 12173040.

The previous prime is 18536417. The next prime is 18536447. The reversal of 18536421 is 12463581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18536421 - 2² = 18536417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18536461) 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, 45910 + ... + 46311.

It is an arithmetic number, because the mean of its divisors is an integer number (3135548).

Almost surely, 2^18536421 is an apocalyptic number.

It is an amenable number.

18536421 is a deficient number, since it is larger than the sum of its proper divisors (6547963).

18536421 is an equidigital number, since it uses as much as digits as its factorization.

18536421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92291.

The product of its digits is 5760, while the sum is 30.

The square root of 18536421 is about 4305.3944070201. The cubic root of 18536421 is about 264.6520697902.

The spelling of 18536421 in words is "eighteen million, five hundred thirty-six thousand, four hundred twenty-one".