25821967 has 4 divisors (see below), whose sum is σ = 26519896. Its totient is φ = 25124040.

The previous prime is 25821949. The next prime is 25822009. The reversal of 25821967 is 76912852.

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 25821967 - 2¹¹ = 25819919 is a prime.

It is a super-3 number, since 3×25821967³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25821937) 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, 348909 + ... + 348982.

It is an arithmetic number, because the mean of its divisors is an integer number (6629974).

Almost surely, 2^25821967 is an apocalyptic number.

25821967 is a deficient number, since it is larger than the sum of its proper divisors (697929).

25821967 is an equidigital number, since it uses as much as digits as its factorization.

25821967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697928.

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

The square root of 25821967 is about 5081.5319540469. The cubic root of 25821967 is about 295.5718754428.

The spelling of 25821967 in words is "twenty-five million, eight hundred twenty-one thousand, nine hundred sixty-seven".