25719989 has 4 divisors (see below), whose sum is σ = 25750656. Its totient is φ = 25689324.

The previous prime is 25719983. The next prime is 25720001. The reversal of 25719989 is 98991752.

It is a happy number.

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-25719989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25719983) 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, 14039 + ... + 15764.

It is an arithmetic number, because the mean of its divisors is an integer number (6437664).

Almost surely, 2^25719989 is an apocalyptic number.

It is an amenable number.

25719989 is a deficient number, since it is larger than the sum of its proper divisors (30667).

25719989 is an equidigital number, since it uses as much as digits as its factorization.

25719989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30666.

The product of its digits is 408240, while the sum is 50.

The square root of 25719989 is about 5071.4878487481. The cubic root of 25719989 is about 295.1822640777.

The spelling of 25719989 in words is "twenty-five million, seven hundred nineteen thousand, nine hundred eighty-nine".