18948354438 has 32 divisors (see below), whose sum is σ = 40850484192. Its totient is φ = 5824742400.

The previous prime is 18948354433. The next prime is 18948354443. The reversal of 18948354438 is 83445384981.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18948354433) and next prime (18948354443).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18948354433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31723 + ... + 197238.

It is an arithmetic number, because the mean of its divisors is an integer number (1276577631).

Almost surely, 2^18948354438 is an apocalyptic number.

18948354438 is an abundant number, since it is smaller than the sum of its proper divisors (21902129754).

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

18948354438 is a wasteful number, since it uses less digits than its factorization.

18948354438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230040.

The product of its digits is 13271040, while the sum is 57.

The spelling of 18948354438 in words is "eighteen billion, nine hundred forty-eight million, three hundred fifty-four thousand, four hundred thirty-eight".