15844802440 has 32 divisors (see below), whose sum is σ = 35977887000. Its totient is φ = 6279773184.

The previous prime is 15844802387. The next prime is 15844802443. The reversal of 15844802440 is 4420844851.

It can be written as a sum of positive squares in 4 ways, for example, as 11906737924 + 3938064516 = 109118^2 + 62754^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 15844802393 and 15844802402.

It is not an unprimeable number, because it can be changed into a prime (15844802443) 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, 1812705 + ... + 1821424.

Almost surely, 2^15844802440 is an apocalyptic number.

15844802440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15844802440 is an abundant number, since it is smaller than the sum of its proper divisors (20133084560).

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

15844802440 is a wasteful number, since it uses less digits than its factorization.

15844802440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3634249 (or 3634245 counting only the distinct ones).

The product of its (nonzero) digits is 163840, while the sum is 40.

The spelling of 15844802440 in words is "fifteen billion, eight hundred forty-four million, eight hundred two thousand, four hundred forty".