25766397 has 16 divisors (see below), whose sum is σ = 38712960. Its totient is φ = 16934400.

The previous prime is 25766353. The next prime is 25766431. The reversal of 25766397 is 79366752.

25766397 is a `hidden beast` number, since 2 + 5 + 7 + 6 + 639 + 7 = 666.

It is not a de Polignac number, because 25766397 - 2⁶ = 25766333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25766317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4804 + ... + 8637.

It is an arithmetic number, because the mean of its divisors is an integer number (2419560).

Almost surely, 2^25766397 is an apocalyptic number.

25766397 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

25766397 is a deficient number, since it is larger than the sum of its proper divisors (12946563).

25766397 is a wasteful number, since it uses less digits than its factorization.

25766397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13521 (or 13515 counting only the distinct ones).

The product of its digits is 476280, while the sum is 45.

The square root of 25766397 is about 5076.0611698442. The cubic root of 25766397 is about 295.3596953042.

The spelling of 25766397 in words is "twenty-five million, seven hundred sixty-six thousand, three hundred ninety-seven".