25821963 has 32 divisors (see below), whose sum is σ = 40979520. Its totient is φ = 16012800.

The previous prime is 25821949. The next prime is 25822009. The reversal of 25821963 is 36912852.

25821963 is a `hidden beast` number, since 2 + 582 + 19 + 63 = 666.

It is not a de Polignac number, because 25821963 - 2⁶ = 25821899 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (25826963) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46081 + ... + 46637.

It is an arithmetic number, because the mean of its divisors is an integer number (1280610).

Almost surely, 2^25821963 is an apocalyptic number.

25821963 is a deficient number, since it is larger than the sum of its proper divisors (15157557).

25821963 is a wasteful number, since it uses less digits than its factorization.

25821963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684 (or 678 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 25821963 is about 5081.5315604648. The cubic root of 25821963 is about 295.5718601807.

The spelling of 25821963 in words is "twenty-five million, eight hundred twenty-one thousand, nine hundred sixty-three".