18426261 has 16 divisors (see below), whose sum is σ = 28764288. Its totient is φ = 10272000.

The previous prime is 18426253. The next prime is 18426263. The reversal of 18426261 is 16262481.

It is not a de Polignac number, because 18426261 - 2³ = 18426253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18426263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9840 + ... + 11561.

It is an arithmetic number, because the mean of its divisors is an integer number (1797768).

Almost surely, 2^18426261 is an apocalyptic number.

It is an amenable number.

18426261 is a deficient number, since it is larger than the sum of its proper divisors (10338027).

18426261 is a wasteful number, since it uses less digits than its factorization.

18426261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21452.

The product of its digits is 4608, while the sum is 30.

The square root of 18426261 is about 4292.5820900712. The cubic root of 18426261 is about 264.1267613242.

The spelling of 18426261 in words is "eighteen million, four hundred twenty-six thousand, two hundred sixty-one".