25940815 has 4 divisors (see below), whose sum is σ = 31128984. Its totient is φ = 20752648.

The previous prime is 25940791. The next prime is 25940839. The reversal of 25940815 is 51804952.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (25940791) and next prime (25940839).

It is a cyclic number.

It is not a de Polignac number, because 25940815 - 2⁹ = 25940303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2594077 + ... + 2594086.

It is an arithmetic number, because the mean of its divisors is an integer number (7782246).

Almost surely, 2^25940815 is an apocalyptic number.

25940815 is a deficient number, since it is larger than the sum of its proper divisors (5188169).

25940815 is an equidigital number, since it uses as much as digits as its factorization.

25940815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5188168.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 25940815 is about 5093.2126403676. The cubic root of 25940815 is about 296.0246471746.

The spelling of 25940815 in words is "twenty-five million, nine hundred forty thousand, eight hundred fifteen".