18874581 has 16 divisors (see below), whose sum is σ = 28899840. Its totient is φ = 10836720.

The previous prime is 18874529. The next prime is 18874591. The reversal of 18874581 is 18547881.

It is not a de Polignac number, because 18874581 - 2¹⁰ = 18873557 is a prime.

It is a super-2 number, since 2×18874581² = 712499615851122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18874501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14425 + ... + 15678.

It is an arithmetic number, because the mean of its divisors is an integer number (1806240).

Almost surely, 2^18874581 is an apocalyptic number.

18874581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18874581 is a deficient number, since it is larger than the sum of its proper divisors (10025259).

18874581 is a wasteful number, since it uses less digits than its factorization.

18874581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30136.

The product of its digits is 71680, while the sum is 42.

The square root of 18874581 is about 4344.4885774968. The cubic root of 18874581 is about 266.2517309063.

The spelling of 18874581 in words is "eighteen million, eight hundred seventy-four thousand, five hundred eighty-one".