18412831 has 4 divisors (see below), whose sum is σ = 18602752. Its totient is φ = 18222912.

The previous prime is 18412817. The next prime is 18412847. The reversal of 18412831 is 13821481.

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 18412831 - 2⁷ = 18412703 is a prime.

It is a super-2 number, since 2×18412831² = 678064690869122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18412831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18412631) 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, 94815 + ... + 95008.

It is an arithmetic number, because the mean of its divisors is an integer number (4650688).

Almost surely, 2^18412831 is an apocalyptic number.

18412831 is a deficient number, since it is larger than the sum of its proper divisors (189921).

18412831 is an equidigital number, since it uses as much as digits as its factorization.

18412831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189920.

The product of its digits is 1536, while the sum is 28.

The square root of 18412831 is about 4291.0174784077. The cubic root of 18412831 is about 264.0625760372.

The spelling of 18412831 in words is "eighteen million, four hundred twelve thousand, eight hundred thirty-one".