25722409 has 8 divisors (see below), whose sum is σ = 27251840. Its totient is φ = 24210576.

The previous prime is 25722401. The next prime is 25722413. The reversal of 25722409 is 90422752.

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 25722409 - 2³ = 25722401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25722401) 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, 1329 + ... + 7294.

It is an arithmetic number, because the mean of its divisors is an integer number (3406480).

Almost surely, 2^25722409 is an apocalyptic number.

It is an amenable number.

25722409 is a deficient number, since it is larger than the sum of its proper divisors (1529431).

25722409 is a wasteful number, since it uses less digits than its factorization.

25722409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8799.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 25722409 is about 5071.7264318967. The cubic root of 25722409 is about 295.1915217109.

Subtracting from 25722409 its sum of digits (31), we obtain a triangular number (25722378 = T₇₁₇₂).

The spelling of 25722409 in words is "twenty-five million, seven hundred twenty-two thousand, four hundred nine".