25991947 has 8 divisors (see below), whose sum is σ = 26464256. Its totient is φ = 25524072.

The previous prime is 25991941. The next prime is 25991957. The reversal of 25991947 is 74919952.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 25991947 - 2³ = 25991939 is a prime.

It is a Duffinian number.

It is a zygodrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 25991897 and 25991906.

It is not an unprimeable number, because it can be changed into a prime (25991941) 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, 12088 + ... + 14074.

It is an arithmetic number, because the mean of its divisors is an integer number (3308032).

Almost surely, 2^25991947 is an apocalyptic number.

25991947 is a deficient number, since it is larger than the sum of its proper divisors (472309).

25991947 is a wasteful number, since it uses less digits than its factorization.

25991947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2217.

The product of its digits is 204120, while the sum is 46.

The square root of 25991947 is about 5098.2297908196. The cubic root of 25991947 is about 296.2190178095.

The spelling of 25991947 in words is "twenty-five million, nine hundred ninety-one thousand, nine hundred forty-seven".