25981642 has 8 divisors (see below), whose sum is σ = 39042432. Its totient is φ = 12967500.

The previous prime is 25981621. The next prime is 25981643. The reversal of 25981642 is 24618952.

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 (25981643) 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, 10234 + ... + 12517.

It is an arithmetic number, because the mean of its divisors is an integer number (4880304).

Almost surely, 2^25981642 is an apocalyptic number.

25981642 is a deficient number, since it is larger than the sum of its proper divisors (13060790).

25981642 is a wasteful number, since it uses less digits than its factorization.

25981642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23324.

The product of its digits is 34560, while the sum is 37.

The square root of 25981642 is about 5097.2190457150. The cubic root of 25981642 is about 296.1798654203.

The spelling of 25981642 in words is "twenty-five million, nine hundred eighty-one thousand, six hundred forty-two".