25953981 has 8 divisors (see below), whose sum is σ = 36426720. Its totient is φ = 16391952.

The previous prime is 25953973. The next prime is 25953989. The reversal of 25953981 is 18935952.

It is an interprime number because it is at equal distance from previous prime (25953973) and next prime (25953989).

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

It is not a de Polignac number, because 25953981 - 2³ = 25953973 is a prime.

It is a super-2 number, since 2×25953981² = 1347218259496722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25953989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227610 + ... + 227723.

It is an arithmetic number, because the mean of its divisors is an integer number (4553340).

Almost surely, 2^25953981 is an apocalyptic number.

It is an amenable number.

25953981 is a deficient number, since it is larger than the sum of its proper divisors (10472739).

25953981 is a wasteful number, since it uses less digits than its factorization.

25953981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455355.

The product of its digits is 97200, while the sum is 42.

The square root of 25953981 is about 5094.5049808593. The cubic root of 25953981 is about 296.0747201492.

The spelling of 25953981 in words is "twenty-five million, nine hundred fifty-three thousand, nine hundred eighty-one".