1515551240 has 64 divisors (see below), whose sum is σ = 3911708160. Its totient is φ = 517674240.

The previous prime is 1515551239. The next prime is 1515551251. The reversal of 1515551240 is 421555151.

1515551240 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1515551240² = 4593791122131075200, which contains 22 as substring.

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, 65894 + ... + 85866.

It is an arithmetic number, because the mean of its divisors is an integer number (61120440).

Almost surely, 2^1515551240 is an apocalyptic number.

1515551240 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 1515551240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1955854080).

1515551240 is an abundant number, since it is smaller than the sum of its proper divisors (2396156920).

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

1515551240 is a wasteful number, since it uses less digits than its factorization.

1515551240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20262 (or 20258 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 29.

The square root of 1515551240 is about 38930.0814281193. The cubic root of 1515551240 is about 1148.6565887900.

The spelling of 1515551240 in words is "one billion, five hundred fifteen million, five hundred fifty-one thousand, two hundred forty".