25556397 has 8 divisors (see below), whose sum is σ = 34335840. Its totient is φ = 16907280.

The previous prime is 25556393. The next prime is 25556411. The reversal of 25556397 is 79365552.

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

It is not a de Polignac number, because 25556397 - 2² = 25556393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25556393) 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, 32122 + ... + 32907.

It is an arithmetic number, because the mean of its divisors is an integer number (4291980).

Almost surely, 2^25556397 is an apocalyptic number.

It is an amenable number.

25556397 is a deficient number, since it is larger than the sum of its proper divisors (8779443).

25556397 is a wasteful number, since it uses less digits than its factorization.

25556397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65163.

The product of its digits is 283500, while the sum is 42.

The square root of 25556397 is about 5055.3335201547. Note that the first 3 decimals coincide. The cubic root of 25556397 is about 294.5550968581. Note that the first 3 decimals are identical.

The spelling of 25556397 in words is "twenty-five million, five hundred fifty-six thousand, three hundred ninety-seven".