25731427 has 4 divisors (see below), whose sum is σ = 25779016. Its totient is φ = 25683840.

The previous prime is 25731403. The next prime is 25731437. The reversal of 25731427 is 72413752.

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 25731427 - 2¹⁹ = 25207139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25731437) 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, 22974 + ... + 24067.

It is an arithmetic number, because the mean of its divisors is an integer number (6444754).

Almost surely, 2^25731427 is an apocalyptic number.

25731427 is a deficient number, since it is larger than the sum of its proper divisors (47589).

25731427 is an equidigital number, since it uses as much as digits as its factorization.

25731427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47588.

The product of its digits is 11760, while the sum is 31.

The square root of 25731427 is about 5072.6154003630. The cubic root of 25731427 is about 295.2260146714.

It can be divided in two parts, 257 and 31427, that added together give a square (31684 = 178²).

The spelling of 25731427 in words is "twenty-five million, seven hundred thirty-one thousand, four hundred twenty-seven".