25391964 has 48 divisors (see below), whose sum is σ = 64319360. Its totient is φ = 7750080.

The previous prime is 25391963. The next prime is 25391969. The reversal of 25391964 is 46919352.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25391963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21099 + ... + 22269.

Almost surely, 2^25391964 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25391964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32159680).

25391964 is an abundant number, since it is smaller than the sum of its proper divisors (38927396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25391964 is a wasteful number, since it uses less digits than its factorization.

25391964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330 (or 1328 counting only the distinct ones).

The product of its digits is 58320, while the sum is 39.

The square root of 25391964 is about 5039.0439569426. The cubic root of 25391964 is about 293.9220025404.

The spelling of 25391964 in words is "twenty-five million, three hundred ninety-one thousand, nine hundred sixty-four".