25329989 has 4 divisors (see below), whose sum is σ = 25355820. Its totient is φ = 25304160.

The previous prime is 25329979. The next prime is 25329991. The reversal of 25329989 is 98992352.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18852964 + 6477025 = 4342^2 + 2545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25329989 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 (25329979) 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, 11384 + ... + 13425.

It is an arithmetic number, because the mean of its divisors is an integer number (6338955).

Almost surely, 2^25329989 is an apocalyptic number.

It is an amenable number.

25329989 is a deficient number, since it is larger than the sum of its proper divisors (25831).

25329989 is a wasteful number, since it uses less digits than its factorization.

25329989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25830.

The product of its digits is 349920, while the sum is 47.

The square root of 25329989 is about 5032.8907200534. The cubic root of 25329989 is about 293.6826793669.

It can be divided in two parts, 2532 and 9989, that added together give a palindrome (12521).

The spelling of 25329989 in words is "twenty-five million, three hundred twenty-nine thousand, nine hundred eighty-nine".