15625940 has 48 divisors (see below), whose sum is σ = 36154944. Its totient is φ = 5672480.

The previous prime is 15625931. The next prime is 15625969. The reversal of 15625940 is 4952651.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 15625897 and 15625906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26327 + ... + 26913.

It is an arithmetic number, because the mean of its divisors is an integer number (753228).

Almost surely, 2^15625940 is an apocalyptic number.

15625940 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 15625940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18077472).

15625940 is an abundant number, since it is smaller than the sum of its proper divisors (20529004).

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

15625940 is a wasteful number, since it uses less digits than its factorization.

15625940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629 (or 605 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 15625940 is about 3952.9659750623. The cubic root of 15625940 is about 250.0050132328.

Subtracting from 15625940 its reverse (4952651), we obtain a square (10673289 = 3267²).

The spelling of 15625940 in words is "fifteen million, six hundred twenty-five thousand, nine hundred forty".