25719997 has 8 divisors (see below), whose sum is σ = 27897912. Its totient is φ = 23616000.

The previous prime is 25719983. The next prime is 25720001. The reversal of 25719997 is 79991752.

It can be written as a sum of positive squares in 4 ways, for example, as 106276 + 25613721 = 326^2 + 5061^2 .

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

It is not a de Polignac number, because 25719997 - 2¹¹ = 25717949 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 25719997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25719937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17754 + ... + 19147.

It is an arithmetic number, because the mean of its divisors is an integer number (3487239).

Almost surely, 2^25719997 is an apocalyptic number.

It is an amenable number.

25719997 is a deficient number, since it is larger than the sum of its proper divisors (2177915).

25719997 is a wasteful number, since it uses less digits than its factorization.

25719997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36959.

The product of its digits is 357210, while the sum is 49.

The square root of 25719997 is about 5071.4886374713. The cubic root of 25719997 is about 295.1822946824.

The spelling of 25719997 in words is "twenty-five million, seven hundred nineteen thousand, nine hundred ninety-seven".