18442931 has 4 divisors (see below), whose sum is σ = 19861632. Its totient is φ = 17024232.

The previous prime is 18442891. The next prime is 18442967. The reversal of 18442931 is 13924481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13924481 = 1447 ⋅9623.

It is a cyclic number.

It is not a de Polignac number, because 18442931 - 2⁶ = 18442867 is a prime.

It is a super-2 number, since 2×18442931² = 680283407741522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18442531) 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, 709331 + ... + 709356.

It is an arithmetic number, because the mean of its divisors is an integer number (4965408).

Almost surely, 2^18442931 is an apocalyptic number.

18442931 is a deficient number, since it is larger than the sum of its proper divisors (1418701).

18442931 is a wasteful number, since it uses less digits than its factorization.

18442931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418700.

The product of its digits is 6912, while the sum is 32.

The square root of 18442931 is about 4294.5233728552. The cubic root of 18442931 is about 264.2063880049.

The spelling of 18442931 in words is "eighteen million, four hundred forty-two thousand, nine hundred thirty-one".