18828431 has 2 divisors, whose sum is σ = 18828432. Its totient is φ = 18828430.

The previous prime is 18828427. The next prime is 18828437. The reversal of 18828431 is 13482881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18828431 - 2² = 18828427 is a prime.

It is a super-2 number, since 2×18828431² = 709019627843522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18828391 and 18828400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18828437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9414215 + 9414216.

It is an arithmetic number, because the mean of its divisors is an integer number (9414216).

Almost surely, 2^18828431 is an apocalyptic number.

18828431 is a deficient number, since it is larger than the sum of its proper divisors (1).

18828431 is an equidigital number, since it uses as much as digits as its factorization.

18828431 is an evil number, because the sum of its binary digits is even.

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

The square root of 18828431 is about 4339.1739997377. The cubic root of 18828431 is about 266.0345508854.

The spelling of 18828431 in words is "eighteen million, eight hundred twenty-eight thousand, four hundred thirty-one".