25997436 has 30 divisors (see below), whose sum is σ = 67963280. Its totient is φ = 8665704.

The previous prime is 25997357. The next prime is 25997443. The reversal of 25997436 is 63479952.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 25997391 and 25997400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 39796 + ... + 40443.

Almost surely, 2^25997436 is an apocalyptic number.

It is an amenable number.

25997436 is an abundant number, since it is smaller than the sum of its proper divisors (41965844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25997436 is a wasteful number, since it uses less digits than its factorization.

25997436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80255 (or 80244 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The square root of 25997436 is about 5098.7680865087. The cubic root of 25997436 is about 296.2398682643.

The spelling of 25997436 in words is "twenty-five million, nine hundred ninety-seven thousand, four hundred thirty-six".