25921867 has 4 divisors (see below), whose sum is σ = 26622496. Its totient is φ = 25221240.

The previous prime is 25921837. The next prime is 25921877. The reversal of 25921867 is 76812952.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25921867 - 2⁷ = 25921739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25921837) 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, 350259 + ... + 350332.

It is an arithmetic number, because the mean of its divisors is an integer number (6655624).

Almost surely, 2^25921867 is an apocalyptic number.

25921867 is a deficient number, since it is larger than the sum of its proper divisors (700629).

25921867 is an equidigital number, since it uses as much as digits as its factorization.

25921867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700628.

The product of its digits is 60480, while the sum is 40.

The square root of 25921867 is about 5091.3521779582. The cubic root of 25921867 is about 295.9525543323.

The spelling of 25921867 in words is "twenty-five million, nine hundred twenty-one thousand, eight hundred sixty-seven".