25939991 has 16 divisors (see below), whose sum is σ = 32590080. Its totient is φ = 20057280.

The previous prime is 25939987. The next prime is 25939993. The reversal of 25939991 is 19993952.

It is a cyclic number.

It is not a de Polignac number, because 25939991 - 2² = 25939987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25939993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9320 + ... + 11778.

It is an arithmetic number, because the mean of its divisors is an integer number (2036880).

Almost surely, 2^25939991 is an apocalyptic number.

25939991 is a deficient number, since it is larger than the sum of its proper divisors (6650089).

25939991 is a wasteful number, since it uses less digits than its factorization.

25939991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2614.

The product of its digits is 196830, while the sum is 47.

The square root of 25939991 is about 5093.1317477560. The cubic root of 25939991 is about 296.0215127717.

The spelling of 25939991 in words is "twenty-five million, nine hundred thirty-nine thousand, nine hundred ninety-one".