18428631 has 16 divisors (see below), whose sum is σ = 26828256. Its totient is φ = 11183616.

The previous prime is 18428623. The next prime is 18428633. The reversal of 18428631 is 13682481.

It is not a de Polignac number, because 18428631 - 2³ = 18428623 is a prime.

It is a super-2 number, since 2×18428631² = 679228881068322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18428592 and 18428601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18428633) 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 15 ways as a sum of consecutive naturals, for example, 390 + ... + 6083.

It is an arithmetic number, because the mean of its divisors is an integer number (1676766).

Almost surely, 2^18428631 is an apocalyptic number.

18428631 is a deficient number, since it is larger than the sum of its proper divisors (8399625).

18428631 is a wasteful number, since it uses less digits than its factorization.

18428631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6562.

The product of its digits is 9216, while the sum is 33.

The square root of 18428631 is about 4292.8581388161. The cubic root of 18428631 is about 264.1380849018.

Subtracting from 18428631 its product of digits (9216), we obtain a triangular number (18419415 = T₆₀₆₉).

The spelling of 18428631 in words is "eighteen million, four hundred twenty-eight thousand, six hundred thirty-one".