18396031 has 4 divisors (see below), whose sum is σ = 18404712. Its totient is φ = 18387352.

The previous prime is 18396013. The next prime is 18396071. The reversal of 18396031 is 13069381.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18396031 - 2⁵ = 18395999 is a prime.

It is a super-2 number, since 2×18396031² = 676827913105922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18395984 and 18396002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18396011) 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, 1176 + ... + 6178.

It is an arithmetic number, because the mean of its divisors is an integer number (4601178).

Almost surely, 2^18396031 is an apocalyptic number.

18396031 is a deficient number, since it is larger than the sum of its proper divisors (8681).

18396031 is an equidigital number, since it uses as much as digits as its factorization.

18396031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8680.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 18396031 is about 4289.0594540062. The cubic root of 18396031 is about 263.9822407322.

The spelling of 18396031 in words is "eighteen million, three hundred ninety-six thousand, thirty-one".