2015391840 has 384 divisors, whose sum is σ = 8174960640. Its totient is φ = 405043200.

The previous prime is 2015391827. The next prime is 2015391863. The reversal of 2015391840 is 481935102.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1144881 + ... + 1146639.

It is an arithmetic number, because the mean of its divisors is an integer number (21288960).

Almost surely, 2^2015391840 is an apocalyptic number.

2015391840 is a gapful number since it is divisible by the number (20) 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 2015391840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4087480320).

2015391840 is an abundant number, since it is smaller than the sum of its proper divisors (6159568800).

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

2015391840 is a wasteful number, since it uses less digits than its factorization.

2015391840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826 (or 1818 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 2015391840 is about 44893.1157305884. The cubic root of 2015391840 is about 1263.1448777460.

The spelling of 2015391840 in words is "two billion, fifteen million, three hundred ninety-one thousand, eight hundred forty".