25389721 has 8 divisors (see below), whose sum is σ = 30723840. Its totient is φ = 20482368.

The previous prime is 25389691. The next prime is 25389739. The reversal of 25389721 is 12798352.

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 25389721 - 2¹⁵ = 25356953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25389751) 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, 106561 + ... + 106798.

It is an arithmetic number, because the mean of its divisors is an integer number (3840480).

Almost surely, 2^25389721 is an apocalyptic number.

It is an amenable number.

25389721 is a deficient number, since it is larger than the sum of its proper divisors (5334119).

25389721 is a wasteful number, since it uses less digits than its factorization.

25389721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213383.

The product of its digits is 30240, while the sum is 37.

The square root of 25389721 is about 5038.8213899681. The cubic root of 25389721 is about 293.9133477488.

The spelling of 25389721 in words is "twenty-five million, three hundred eighty-nine thousand, seven hundred twenty-one".