2015123240 has 64 divisors (see below), whose sum is σ = 4887766800. Its totient is φ = 743288832.

The previous prime is 2015123183. The next prime is 2015123249. The reversal of 2015123240 is 423215102.

It can be written as a sum of positive squares in 8 ways, for example, as 729316 + 2014393924 = 854^2 + 44882^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (2015123249) 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, 972926 + ... + 974994.

Almost surely, 2^2015123240 is an apocalyptic number.

2015123240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2015123240 is an abundant number, since it is smaller than the sum of its proper divisors (2872643560).

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

2015123240 is a wasteful number, since it uses less digits than its factorization.

2015123240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3966 (or 3962 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2015123240 is about 44890.1240809156. The cubic root of 2015123240 is about 1263.0887603232.

Adding to 2015123240 its reverse (423215102), we get a palindrome (2438338342).

The spelling of 2015123240 in words is "two billion, fifteen million, one hundred twenty-three thousand, two hundred forty".