18931842 has 24 divisors (see below), whose sum is σ = 41177916. Its totient is φ = 6286176.

The previous prime is 18931837. The next prime is 18931859. The reversal of 18931842 is 24813981.

It can be written as a sum of positive squares in 2 ways, for example, as 14356521 + 4575321 = 3789^2 + 2139^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18931797 and 18931806.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3088 + ... + 6884.

Almost surely, 2^18931842 is an apocalyptic number.

18931842 is an abundant number, since it is smaller than the sum of its proper divisors (22246074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18931842 is a wasteful number, since it uses less digits than its factorization.

18931842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4082 (or 4079 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 18931842 is about 4351.0736606038. The cubic root of 18931842 is about 266.5207072768.

The spelling of 18931842 in words is "eighteen million, nine hundred thirty-one thousand, eight hundred forty-two".