25172405 has 8 divisors (see below), whose sum is σ = 30243672. Its totient is φ = 20113408.

The previous prime is 25172387. The next prime is 25172417. The reversal of 25172405 is 50427152.

It can be written as a sum of positive squares in 4 ways, for example, as 9284209 + 15888196 = 3047^2 + 3986^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25172405 - 2¹⁰ = 25171381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2309 + ... + 7461.

It is an arithmetic number, because the mean of its divisors is an integer number (3780459).

Almost surely, 2^25172405 is an apocalyptic number.

It is an amenable number.

25172405 is a deficient number, since it is larger than the sum of its proper divisors (5071267).

25172405 is an equidigital number, since it uses as much as digits as its factorization.

25172405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6135.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 25172405 is about 5017.2108785659. The cubic root of 25172405 is about 293.0723883159.

Adding to 25172405 its reverse (50427152), we get a palindrome (75599557).

The spelling of 25172405 in words is "twenty-five million, one hundred seventy-two thousand, four hundred five".