15115040 has 48 divisors (see below), whose sum is σ = 37816632. Its totient is φ = 5689344.

The previous prime is 15115039. The next prime is 15115043. The reversal of 15115040 is 4051151.

It can be written as a sum of positive squares in 4 ways, for example, as 15085456 + 29584 = 3884^2 + 172^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (15115043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59 + ... + 5498.

Almost surely, 2^15115040 is an apocalyptic number.

15115040 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 15115040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18908316).

15115040 is an abundant number, since it is smaller than the sum of its proper divisors (22701592).

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

15115040 is a wasteful number, since it uses less digits than its factorization.

15115040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5589 (or 5581 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 15115040 is about 3887.8065795510. The cubic root of 15115040 is about 247.2500759108.

Adding to 15115040 its reverse (4051151), we get a palindrome (19166191).

The spelling of 15115040 in words is "fifteen million, one hundred fifteen thousand, forty".