25478409 has 8 divisors (see below), whose sum is σ = 37059552. Its totient is φ = 15441440.

The previous prime is 25478407. The next prime is 25478413. The reversal of 25478409 is 90487452.

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 25478409 - 2¹ = 25478407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25478407) 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, 386004 + ... + 386069.

It is an arithmetic number, because the mean of its divisors is an integer number (4632444).

Almost surely, 2^25478409 is an apocalyptic number.

It is an amenable number.

25478409 is a deficient number, since it is larger than the sum of its proper divisors (11581143).

25478409 is a wasteful number, since it uses less digits than its factorization.

25478409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772087.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 25478409 is about 5047.6141889015. The cubic root of 25478409 is about 294.2551697401.

The spelling of 25478409 in words is "twenty-five million, four hundred seventy-eight thousand, four hundred nine".