25217949 has 8 divisors (see below), whose sum is σ = 34175392. Its totient is φ = 16536240.

The previous prime is 25217947. The next prime is 25217981. The reversal of 25217949 is 94971252.

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

It is not a de Polignac number, because 25217949 - 2¹ = 25217947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25217947) 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, 68719 + ... + 69084.

It is an arithmetic number, because the mean of its divisors is an integer number (4271924).

Almost surely, 2^25217949 is an apocalyptic number.

It is an amenable number.

25217949 is a deficient number, since it is larger than the sum of its proper divisors (8957443).

25217949 is a wasteful number, since it uses less digits than its factorization.

25217949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137867.

The product of its digits is 45360, while the sum is 39.

The square root of 25217949 is about 5021.7476041713. The cubic root of 25217949 is about 293.2490321053.

The spelling of 25217949 in words is "twenty-five million, two hundred seventeen thousand, nine hundred forty-nine".