15970640 has 120 divisors (see below), whose sum is σ = 45354240. Its totient is φ = 5121792.

The previous prime is 15970639. The next prime is 15970657. The reversal of 15970640 is 4607951.

It is a happy number.

15970640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×15970640² = 510122684019200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15970597 and 15970606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 202121 + ... + 202199.

It is an arithmetic number, because the mean of its divisors is an integer number (377952).

Almost surely, 2^15970640 is an apocalyptic number.

15970640 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 15970640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22677120).

15970640 is an abundant number, since it is smaller than the sum of its proper divisors (29383600).

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

15970640 is a wasteful number, since it uses less digits than its factorization.

15970640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 15970640 is about 3996.3283148410. The cubic root of 15970640 is about 251.8299852646.

The spelling of 15970640 in words is "fifteen million, nine hundred seventy thousand, six hundred forty".