25423209 has 18 divisors (see below), whose sum is σ = 42718650. Its totient is φ = 14527296.

The previous prime is 25423207. The next prime is 25423243. The reversal of 25423209 is 90232452.

It can be written as a sum of positive squares in only one way, i.e., 25401600 + 21609 = 5040^2 + 147^2 .

It is not a de Polignac number, because 25423209 - 2¹ = 25423207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25423207) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 28384 + ... + 29265.

Almost surely, 2^25423209 is an apocalyptic number.

It is an amenable number.

25423209 is a deficient number, since it is larger than the sum of its proper divisors (17295441).

25423209 is a wasteful number, since it uses less digits than its factorization.

25423209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57669 (or 57659 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 25423209 is about 5042.1432942748. The cubic root of 25423209 is about 294.0425108597.

The spelling of 25423209 in words is "twenty-five million, four hundred twenty-three thousand, two hundred nine".