15880040 has 96 divisors (see below), whose sum is σ = 41799240. Its totient is φ = 5406720.

The previous prime is 15880037. The next prime is 15880043. The reversal of 15880040 is 4008851.

It is an interprime number because it is at equal distance from previous prime (15880037) and next prime (15880043).

It can be written as a sum of positive squares in 4 ways, for example, as 12859396 + 3020644 = 3586^2 + 1738^2 .

It is a junction number, because it is equal to n+sod(n) for n = 15879991 and 15880009.

It is not an unprimeable number, because it can be changed into a prime (15880043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82184 + ... + 82376.

Almost surely, 2^15880040 is an apocalyptic number.

15880040 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 15880040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20899620).

15880040 is an abundant number, since it is smaller than the sum of its proper divisors (25919200).

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

15880040 is a wasteful number, since it uses less digits than its factorization.

15880040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 15880040 is about 3984.9767878872. The cubic root of 15880040 is about 251.3528790008.

Adding to 15880040 its reverse (4008851), we get a palindrome (19888891).

The spelling of 15880040 in words is "fifteen million, eight hundred eighty thousand, forty".