25972809 has 8 divisors (see below), whose sum is σ = 35284032. Its totient is φ = 16988400.

The previous prime is 25972799. The next prime is 25972813. The reversal of 25972809 is 90827952.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25972809 - 2¹¹ = 25970761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25970809) 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, 81517 + ... + 81834.

It is an arithmetic number, because the mean of its divisors is an integer number (4410504).

Almost surely, 2^25972809 is an apocalyptic number.

It is an amenable number.

25972809 is a deficient number, since it is larger than the sum of its proper divisors (9311223).

25972809 is a wasteful number, since it uses less digits than its factorization.

25972809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163407.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 25972809 is about 5096.3525192043. The cubic root of 25972809 is about 296.1462974459.

The spelling of 25972809 in words is "twenty-five million, nine hundred seventy-two thousand, eight hundred nine".