25421669 has 16 divisors (see below), whose sum is σ = 31438848. Its totient is φ = 20017152.

The previous prime is 25421659. The next prime is 25421687. The reversal of 25421669 is 96612452.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25421669 - 2⁸ = 25421413 is a prime.

It is a super-2 number, since 2×25421669² = 1292522509491122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25421629) 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, 22844 + ... + 23930.

It is an arithmetic number, because the mean of its divisors is an integer number (1964928).

Almost surely, 2^25421669 is an apocalyptic number.

It is an amenable number.

25421669 is a deficient number, since it is larger than the sum of its proper divisors (6017179).

25421669 is a wasteful number, since it uses less digits than its factorization.

25421669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364.

The product of its digits is 25920, while the sum is 35.

The square root of 25421669 is about 5041.9905791265. The cubic root of 25421669 is about 294.0365735734.

The spelling of 25421669 in words is "twenty-five million, four hundred twenty-one thousand, six hundred sixty-nine".