1518989640 has 128 divisors (see below), whose sum is σ = 5270952960. Its totient is φ = 342998784.

The previous prime is 1518989623. The next prime is 1518989653. The reversal of 1518989640 is 469898151.

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, 58827 + ... + 80613.

It is an arithmetic number, because the mean of its divisors is an integer number (41179320).

Almost surely, 2^1518989640 is an apocalyptic number.

1518989640 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 1518989640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2635476480).

1518989640 is an abundant number, since it is smaller than the sum of its proper divisors (3751963320).

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

1518989640 is a wasteful number, since it uses less digits than its factorization.

1518989640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21891 (or 21887 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 51.

The square root of 1518989640 is about 38974.2176316600. The cubic root of 1518989640 is about 1149.5246024947.

The spelling of 1518989640 in words is "one billion, five hundred eighteen million, nine hundred eighty-nine thousand, six hundred forty".