25479909 has 48 divisors (see below), whose sum is σ = 46230912. Its totient is φ = 13163904.

The previous prime is 25479907. The next prime is 25479911. The reversal of 25479909 is 90997452.

It is an interprime number because it is at equal distance from previous prime (25479907) and next prime (25479911).

It is not a de Polignac number, because 25479909 - 2¹ = 25479907 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25479907) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43114 + ... + 43700.

It is an arithmetic number, because the mean of its divisors is an integer number (963144).

Almost surely, 2^25479909 is an apocalyptic number.

It is an amenable number.

25479909 is a deficient number, since it is larger than the sum of its proper divisors (20751003).

25479909 is a wasteful number, since it uses less digits than its factorization.

25479909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666 (or 663 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 25479909 is about 5047.7627717633. The cubic root of 25479909 is about 294.2609442253.

The spelling of 25479909 in words is "twenty-five million, four hundred seventy-nine thousand, nine hundred nine".