25691938 has 4 divisors (see below), whose sum is σ = 38537910. Its totient is φ = 12845968.

The previous prime is 25691923. The next prime is 25691969. The reversal of 25691938 is 83919652.

It is a happy number.

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., 20277009 + 5414929 = 4503^2 + 2327^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25691894 and 25691903.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6422983 + ... + 6422986.

Almost surely, 2^25691938 is an apocalyptic number.

25691938 is a deficient number, since it is larger than the sum of its proper divisors (12845972).

25691938 is a wasteful number, since it uses less digits than its factorization.

25691938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12845971.

The product of its digits is 116640, while the sum is 43.

The square root of 25691938 is about 5068.7215350619. The cubic root of 25691938 is about 295.0749134652.

It can be divided in two parts, 2 and 5691938, that multiplied together give a square (11383876 = 3374²).

The spelling of 25691938 in words is "twenty-five million, six hundred ninety-one thousand, nine hundred thirty-eight".