18426891 has 12 divisors (see below), whose sum is σ = 28580712. Its totient is φ = 10529568.

The previous prime is 18426883. The next prime is 18426899. The reversal of 18426891 is 19862481.

It is an interprime number because it is at equal distance from previous prime (18426883) and next prime (18426899).

It is not a de Polignac number, because 18426891 - 2³ = 18426883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18426899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62530 + ... + 62823.

It is an arithmetic number, because the mean of its divisors is an integer number (2381726).

Almost surely, 2^18426891 is an apocalyptic number.

18426891 is a deficient number, since it is larger than the sum of its proper divisors (10153821).

18426891 is a wasteful number, since it uses less digits than its factorization.

18426891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125370 (or 125363 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 18426891 is about 4292.6554718496. The cubic root of 18426891 is about 264.1297714839.

The spelling of 18426891 in words is "eighteen million, four hundred twenty-six thousand, eight hundred ninety-one".