18406031 has 4 divisors (see below), whose sum is σ = 21035472. Its totient is φ = 15776592.

The previous prime is 18406027. The next prime is 18406043. The reversal of 18406031 is 13060481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18406031 - 2² = 18406027 is a prime.

It is a super-2 number, since 2×18406031² = 677563954345922, 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 = 18405988 and 18406006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18406051) 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 3 ways as a sum of consecutive naturals, for example, 1314710 + ... + 1314723.

It is an arithmetic number, because the mean of its divisors is an integer number (5258868).

Almost surely, 2^18406031 is an apocalyptic number.

18406031 is a deficient number, since it is larger than the sum of its proper divisors (2629441).

18406031 is an equidigital number, since it uses as much as digits as its factorization.

18406031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2629440.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 18406031 is about 4290.2250523720. The cubic root of 18406031 is about 264.0300652551.

The spelling of 18406031 in words is "eighteen million, four hundred six thousand, thirty-one".