25382813 has 8 divisors (see below), whose sum is σ = 26494776. Its totient is φ = 24294400.

The previous prime is 25382809. The next prime is 25382839. The reversal of 25382813 is 31828352.

25382813 = 3562² + 3563².

It can be written as a sum of positive squares in 4 ways, for example, as 1304164 + 24078649 = 1142^2 + 4907^2 .

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 25382813 - 2² = 25382809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25382813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25382873) 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, 3668 + ... + 8013.

It is an arithmetic number, because the mean of its divisors is an integer number (3311847).

Almost surely, 2^25382813 is an apocalyptic number.

25382813 is the 3563-rd centered square number.

It is an amenable number.

25382813 is a deficient number, since it is larger than the sum of its proper divisors (1111963).

25382813 is a wasteful number, since it uses less digits than its factorization.

25382813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11775.

The product of its digits is 11520, while the sum is 32.

The square root of 25382813 is about 5038.1358655757. The cubic root of 25382813 is about 293.8866894859.

The spelling of 25382813 in words is "twenty-five million, three hundred eighty-two thousand, eight hundred thirteen".