25981898 has 4 divisors (see below), whose sum is σ = 38972850. Its totient is φ = 12990948.

The previous prime is 25981897. The next prime is 25981909. The reversal of 25981898 is 89818952.

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

It can be written as a sum of positive squares in only one way, i.e., 25877569 + 104329 = 5087^2 + 323^2 .

It is not an unprimeable number, because it can be changed into a prime (25981897) 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 as a sum of consecutive naturals, namely, 6495473 + ... + 6495476.

Almost surely, 2^25981898 is an apocalyptic number.

25981898 is a deficient number, since it is larger than the sum of its proper divisors (12990952).

25981898 is a wasteful number, since it uses less digits than its factorization.

25981898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12990951.

The product of its digits is 414720, while the sum is 50.

The square root of 25981898 is about 5097.2441573854. The cubic root of 25981898 is about 296.1808381814.

The spelling of 25981898 in words is "twenty-five million, nine hundred eighty-one thousand, eight hundred ninety-eight".