25761397 has 4 divisors (see below), whose sum is σ = 27117280. Its totient is φ = 24405516.

The previous prime is 25761391. The next prime is 25761451. The reversal of 25761397 is 79316752.

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 a de Polignac number, because none of the positive numbers 2^k-25761397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25761391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 677913 + ... + 677950.

It is an arithmetic number, because the mean of its divisors is an integer number (6779320).

Almost surely, 2^25761397 is an apocalyptic number.

It is an amenable number.

25761397 is a deficient number, since it is larger than the sum of its proper divisors (1355883).

25761397 is a wasteful number, since it uses less digits than its factorization.

25761397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355882.

The product of its digits is 79380, while the sum is 40.

The square root of 25761397 is about 5075.5686380937. The cubic root of 25761397 is about 295.3405891015.

The spelling of 25761397 in words is "twenty-five million, seven hundred sixty-one thousand, three hundred ninety-seven".