25640349 has 8 divisors (see below), whose sum is σ = 39071040. Its totient is φ = 14651616.

The previous prime is 25640339. The next prime is 25640353. The reversal of 25640349 is 94304652.

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

It is not a de Polignac number, because 25640349 - 2⁷ = 25640221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640309) 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, 610464 + ... + 610505.

It is an arithmetic number, because the mean of its divisors is an integer number (4883880).

Almost surely, 2^25640349 is an apocalyptic number.

It is an amenable number.

25640349 is a deficient number, since it is larger than the sum of its proper divisors (13430691).

25640349 is a wasteful number, since it uses less digits than its factorization.

25640349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220979.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 25640349 is about 5063.6300220297. The cubic root of 25640349 is about 294.8772792240.

The spelling of 25640349 in words is "twenty-five million, six hundred forty thousand, three hundred forty-nine".