25939642 has 4 divisors (see below), whose sum is σ = 38909466. Its totient is φ = 12969820.

The previous prime is 25939633. The next prime is 25939649. The reversal of 25939642 is 24693952.

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., 14508481 + 11431161 = 3809^2 + 3381^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 25939595 and 25939604.

It is not an unprimeable number, because it can be changed into a prime (25939649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6484909 + ... + 6484912.

Almost surely, 2^25939642 is an apocalyptic number.

25939642 is a deficient number, since it is larger than the sum of its proper divisors (12969824).

25939642 is a wasteful number, since it uses less digits than its factorization.

25939642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12969823.

The product of its digits is 116640, while the sum is 40.

The square root of 25939642 is about 5093.0974858135. The cubic root of 25939642 is about 296.0201851952.

The spelling of 25939642 in words is "twenty-five million, nine hundred thirty-nine thousand, six hundred forty-two".