18814621 has 16 divisors (see below), whose sum is σ = 22627584. Its totient is φ = 15295104.

The previous prime is 18814619. The next prime is 18814633. The reversal of 18814621 is 12641881.

It is a cyclic number.

It is not a de Polignac number, because 18814621 - 2¹ = 18814619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18814651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21631 + ... + 22483.

It is an arithmetic number, because the mean of its divisors is an integer number (1414224).

Almost surely, 2^18814621 is an apocalyptic number.

It is an amenable number.

18814621 is a deficient number, since it is larger than the sum of its proper divisors (3812963).

18814621 is a wasteful number, since it uses less digits than its factorization.

18814621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020.

The product of its digits is 3072, while the sum is 31.

The square root of 18814621 is about 4337.5823911483. The cubic root of 18814621 is about 265.9694926100.

The spelling of 18814621 in words is "eighteen million, eight hundred fourteen thousand, six hundred twenty-one".