25276421 has 4 divisors (see below), whose sum is σ = 25288032. Its totient is φ = 25264812.

The previous prime is 25276417. The next prime is 25276463. The reversal of 25276421 is 12467252.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25276421 - 2² = 25276417 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25275421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1451 + ... + 7256.

It is an arithmetic number, because the mean of its divisors is an integer number (6322008).

It is a Poulet number, since it divides 2^25276420-1.

Almost surely, 2^25276421 is an apocalyptic number.

25276421 is the 2903-rd octagonal number.

It is an amenable number.

25276421 is a deficient number, since it is larger than the sum of its proper divisors (11611).

25276421 is an equidigital number, since it uses as much as digits as its factorization.

25276421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11610.

The product of its digits is 6720, while the sum is 29.

The square root of 25276421 is about 5027.5661109527. The cubic root of 25276421 is about 293.4755060061.

The spelling of 25276421 in words is "twenty-five million, two hundred seventy-six thousand, four hundred twenty-one".