15797840 has 40 divisors (see below), whose sum is σ = 37363680. Its totient is φ = 6210176.

The previous prime is 15797819. The next prime is 15797843. The reversal of 15797840 is 4879751.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15797843) 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, 3047 + ... + 6393.

It is an arithmetic number, because the mean of its divisors is an integer number (934092).

Almost surely, 2^15797840 is an apocalyptic number.

15797840 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 15797840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18681840).

15797840 is an abundant number, since it is smaller than the sum of its proper divisors (21565840).

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

15797840 is a wasteful number, since it uses less digits than its factorization.

15797840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3419 (or 3413 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 15797840 is about 3974.6496700967. The cubic root of 15797840 is about 250.9184351093.

The spelling of 15797840 in words is "fifteen million, seven hundred ninety-seven thousand, eight hundred forty".