18084631 has 4 divisors (see below), whose sum is σ = 18165952. Its totient is φ = 18003312.

The previous prime is 18084629. The next prime is 18084641. The reversal of 18084631 is 13648081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13648081 = 1759 ⋅7759.

It is a cyclic number.

It is not a de Polignac number, because 18084631 - 2¹ = 18084629 is a prime.

It is a super-2 number, since 2×18084631² = 654107756812322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18084593 and 18084602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18084611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40326 + ... + 40771.

It is an arithmetic number, because the mean of its divisors is an integer number (4541488).

Almost surely, 2^18084631 is an apocalyptic number.

18084631 is a deficient number, since it is larger than the sum of its proper divisors (81321).

18084631 is an equidigital number, since it uses as much as digits as its factorization.

18084631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81320.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18084631 is about 4252.6028500202. The cubic root of 18084631 is about 262.4842306476.

It can be divided in two parts, 180846 and 31, that multiplied together give a triangular number (5606226 = T₃₃₄₈).

The spelling of 18084631 in words is "eighteen million, eighty-four thousand, six hundred thirty-one".