25420009 has 4 divisors (see below), whose sum is σ = 26011216. Its totient is φ = 24828804.

The previous prime is 25420007. The next prime is 25420033. The reversal of 25420009 is 90002452.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25420009 - 2¹ = 25420007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25420007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295539 + ... + 295624.

It is an arithmetic number, because the mean of its divisors is an integer number (6502804).

Almost surely, 2^25420009 is an apocalyptic number.

It is an amenable number.

25420009 is a deficient number, since it is larger than the sum of its proper divisors (591207).

25420009 is an equidigital number, since it uses as much as digits as its factorization.

25420009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591206.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 25420009 is about 5041.8259589161. The cubic root of 25420009 is about 294.0301733729.

The spelling of 25420009 in words is "twenty-five million, four hundred twenty thousand, nine".