25409697 has 4 divisors (see below), whose sum is σ = 33879600. Its totient is φ = 16939796.

The previous prime is 25409663. The next prime is 25409711. The reversal of 25409697 is 79690452.

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 25409697 - 2⁷ = 25409569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25409497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4234947 + ... + 4234952.

It is an arithmetic number, because the mean of its divisors is an integer number (8469900).

Almost surely, 2^25409697 is an apocalyptic number.

It is an amenable number.

25409697 is a deficient number, since it is larger than the sum of its proper divisors (8469903).

25409697 is an equidigital number, since it uses as much as digits as its factorization.

25409697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8469902.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 25409697 is about 5040.8032098069. The cubic root of 25409697 is about 293.9904087759.

It can be divided in two parts, 25409 and 697, that added together give a triangular number (26106 = T₂₂₈).

The spelling of 25409697 in words is "twenty-five million, four hundred nine thousand, six hundred ninety-seven".