25354721 has 16 divisors (see below), whose sum is σ = 30643200. Its totient is φ = 20493648.

The previous prime is 25354709. The next prime is 25354751. The reversal of 25354721 is 12745352.

It is a happy number.

It is not a de Polignac number, because 25354721 - 2¹⁸ = 25092577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25354751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50156 + ... + 50658.

It is an arithmetic number, because the mean of its divisors is an integer number (1915200).

Almost surely, 2^25354721 is an apocalyptic number.

It is an amenable number.

25354721 is a deficient number, since it is larger than the sum of its proper divisors (5288479).

25354721 is a wasteful number, since it uses less digits than its factorization.

25354721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908.

The product of its digits is 8400, while the sum is 29.

The square root of 25354721 is about 5035.3471578432. The cubic root of 25354721 is about 293.7782314198.

The spelling of 25354721 in words is "twenty-five million, three hundred fifty-four thousand, seven hundred twenty-one".