18939337292 has 24 divisors (see below), whose sum is σ = 33947187120. Its totient is φ = 9242735040.

The previous prime is 18939337273. The next prime is 18939337301. The reversal of 18939337292 is 29273393981.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294959 + ... + 353382.

It is an arithmetic number, because the mean of its divisors is an integer number (1414466130).

Almost surely, 2^18939337292 is an apocalyptic number.

It is an amenable number.

18939337292 is a deficient number, since it is larger than the sum of its proper divisors (15007849828).

18939337292 is a wasteful number, since it uses less digits than its factorization.

18939337292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648521 (or 648519 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 56.

The spelling of 18939337292 in words is "eighteen billion, nine hundred thirty-nine million, three hundred thirty-seven thousand, two hundred ninety-two".