18438827 has 12 divisors (see below), whose sum is σ = 20489448. Its totient is φ = 16579200.

The previous prime is 18438821. The next prime is 18438841. The reversal of 18438827 is 72883481.

It is not a de Polignac number, because 18438827 - 2²⁰ = 17390251 is a prime.

It is a super-2 number, since 2×18438827² = 679980682271858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18438821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10952 + ... + 12522.

It is an arithmetic number, because the mean of its divisors is an integer number (1707454).

Almost surely, 2^18438827 is an apocalyptic number.

18438827 is a deficient number, since it is larger than the sum of its proper divisors (2050621).

18438827 is a wasteful number, since it uses less digits than its factorization.

18438827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690 (or 1679 counting only the distinct ones).

The product of its digits is 86016, while the sum is 41.

The square root of 18438827 is about 4294.0455284033. The cubic root of 18438827 is about 264.1867891054.

The spelling of 18438827 in words is "eighteen million, four hundred thirty-eight thousand, eight hundred twenty-seven".