25943491 has 16 divisors (see below), whose sum is σ = 30976000. Its totient is φ = 21707784.

The previous prime is 25943473. The next prime is 25943503. The reversal of 25943491 is 19434952.

It is not a de Polignac number, because 25943491 - 2¹⁵ = 25910723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25943491.

It is not an unprimeable number, because it can be changed into a prime (25943441) 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, 13870 + ... + 15628.

It is an arithmetic number, because the mean of its divisors is an integer number (1936000).

Almost surely, 2^25943491 is an apocalyptic number.

25943491 is a deficient number, since it is larger than the sum of its proper divisors (5032509).

25943491 is an equidigital number, since it uses as much as digits as its factorization.

25943491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823 (or 1809 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 25943491 is about 5093.4753361531. The cubic root of 25943491 is about 296.0348259182.

The spelling of 25943491 in words is "twenty-five million, nine hundred forty-three thousand, four hundred ninety-one".