25998986 has 8 divisors (see below), whose sum is σ = 41998404. Its totient is φ = 11999520.

The previous prime is 25998983. The next prime is 25999009. The reversal of 25998986 is 68989952.

It can be written as a sum of positive squares in 2 ways, for example, as 19971961 + 6027025 = 4469^2 + 2455^2 .

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

It is not an unprimeable number, because it can be changed into a prime (25998983) 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, 499955 + ... + 500006.

Almost surely, 2^25998986 is an apocalyptic number.

25998986 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

25998986 is a deficient number, since it is larger than the sum of its proper divisors (15999418).

25998986 is a wasteful number, since it uses less digits than its factorization.

25998986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999976.

The product of its digits is 2799360, while the sum is 56.

The square root of 25998986 is about 5098.9200817428. The cubic root of 25998986 is about 296.2457555458.

The spelling of 25998986 in words is "twenty-five million, nine hundred ninety-eight thousand, nine hundred eighty-six".