18428831 has 8 divisors (see below), whose sum is σ = 18861984. Its totient is φ = 18000640.

The previous prime is 18428807. The next prime is 18428857. The reversal of 18428831 is 13882481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18428831 - 2¹⁴ = 18412447 is a prime.

It is a super-2 number, since 2×18428831² = 679243624053122, 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 = 18428791 and 18428800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18428801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6875 + ... + 9171.

It is an arithmetic number, because the mean of its divisors is an integer number (2357748).

Almost surely, 2^18428831 is an apocalyptic number.

18428831 is a deficient number, since it is larger than the sum of its proper divisors (433153).

18428831 is a wasteful number, since it uses less digits than its factorization.

18428831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2481.

The product of its digits is 12288, while the sum is 35.

The square root of 18428831 is about 4292.8814332567. The cubic root of 18428831 is about 264.1390404336.

The spelling of 18428831 in words is "eighteen million, four hundred twenty-eight thousand, eight hundred thirty-one".