15405625 has 15 divisors (see below), whose sum is σ = 19374267. Its totient is φ = 12246000.

The previous prime is 15405623. The next prime is 15405659. The reversal of 15405625 is 52650451.

The square root of 15405625 is 3925.

It is a perfect power (a square), and thus also a powerful number.

15405625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 7 ways, for example, as 14160169 + 1245456 = 3763^2 + 1116^2 .

It is not a de Polignac number, because 15405625 - 2¹ = 15405623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15405593 and 15405602.

It is not an unprimeable number, because it can be changed into a prime (15405623) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 98047 + ... + 98203.

Almost surely, 2^15405625 is an apocalyptic number.

15405625 is the 3925-th square number.

15405625 is the 1963-rd centered octagonal number.

It is an amenable number.

15405625 is a deficient number, since it is larger than the sum of its proper divisors (3968642).

15405625 is an frugal number, since it uses more digits than its factorization.

15405625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The cubic root of 15405625 is about 248.8244812864.

The spelling of 15405625 in words is "fifteen million, four hundred five thousand, six hundred twenty-five".