18238867746 has 32 divisors (see below), whose sum is σ = 41166100800. Its totient is φ = 5336345280.

The previous prime is 18238867723. The next prime is 18238867817. The reversal of 18238867746 is 64776883281.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18238867746.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4762681 + ... + 4766508.

It is an arithmetic number, because the mean of its divisors is an integer number (1286440650).

Almost surely, 2^18238867746 is an apocalyptic number.

18238867746 is an abundant number, since it is smaller than the sum of its proper divisors (22927233054).

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

18238867746 is a wasteful number, since it uses less digits than its factorization.

18238867746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9529234.

The product of its digits is 21676032, while the sum is 60.

The spelling of 18238867746 in words is "eighteen billion, two hundred thirty-eight million, eight hundred sixty-seven thousand, seven hundred forty-six".