25438609 has 16 divisors (see below), whose sum is σ = 29933568. Its totient is φ = 21166992.

The previous prime is 25438607. The next prime is 25438619. The reversal of 25438609 is 90683452.

It is not a de Polignac number, because 25438609 - 2¹ = 25438607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25438601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54712 + ... + 55174.

It is an arithmetic number, because the mean of its divisors is an integer number (1870848).

Almost surely, 2^25438609 is an apocalyptic number.

It is an amenable number.

25438609 is a deficient number, since it is larger than the sum of its proper divisors (4494959).

25438609 is a wasteful number, since it uses less digits than its factorization.

25438609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 25438609 is about 5043.6701914380. The cubic root of 25438609 is about 294.1018705396.

The spelling of 25438609 in words is "twenty-five million, four hundred thirty-eight thousand, six hundred nine".