25726821 has 16 divisors (see below), whose sum is σ = 34898688. Its totient is φ = 16856000.

The previous prime is 25726801. The next prime is 25726829. The reversal of 25726821 is 12862752.

It is a cyclic number.

It is not a de Polignac number, because 25726821 - 2¹¹ = 25724773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25726829) 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, 59476 + ... + 59906.

It is an arithmetic number, because the mean of its divisors is an integer number (2181168).

Almost surely, 2^25726821 is an apocalyptic number.

It is an amenable number.

25726821 is a deficient number, since it is larger than the sum of its proper divisors (9171867).

25726821 is a wasteful number, since it uses less digits than its factorization.

25726821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732.

The product of its digits is 13440, while the sum is 33.

The square root of 25726821 is about 5072.1613736158. The cubic root of 25726821 is about 295.2083981828.

The spelling of 25726821 in words is "twenty-five million, seven hundred twenty-six thousand, eight hundred twenty-one".