25813973 has 8 divisors (see below), whose sum is σ = 28275480. Its totient is φ = 23457280.

The previous prime is 25813937. The next prime is 25813999. The reversal of 25813973 is 37931852.

It can be written as a sum of positive squares in 4 ways, for example, as 2067844 + 23746129 = 1438^2 + 4873^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25813973 - 2¹⁸ = 25551829 is a prime.

It is a super-2 number, since 2×25813973² = 1332722404089458, which contains 22 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 (25813873) 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, 25688 + ... + 26673.

It is an arithmetic number, because the mean of its divisors is an integer number (3534435).

Almost surely, 2^25813973 is an apocalyptic number.

It is an amenable number.

25813973 is a deficient number, since it is larger than the sum of its proper divisors (2461507).

25813973 is a wasteful number, since it uses less digits than its factorization.

25813973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52407.

The product of its digits is 45360, while the sum is 38.

The square root of 25813973 is about 5080.7453193405. The cubic root of 25813973 is about 295.5413711124.

The spelling of 25813973 in words is "twenty-five million, eight hundred thirteen thousand, nine hundred seventy-three".