18741391440 has 160 divisors (see below), whose sum is σ = 58645282176. Its totient is φ = 4950865920.

The previous prime is 18741391429. The next prime is 18741391489. The reversal of 18741391440 is 4419314781.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18741391392 and 18741391401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18500374 + ... + 18501386.

Almost surely, 2^18741391440 is an apocalyptic number.

18741391440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18741391440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29322641088).

18741391440 is an abundant number, since it is smaller than the sum of its proper divisors (39903890736).

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

18741391440 is a wasteful number, since it uses less digits than its factorization.

18741391440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1677 (or 1671 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 18741391440 in words is "eighteen billion, seven hundred forty-one million, three hundred ninety-one thousand, four hundred forty".