25857387 has 24 divisors (see below), whose sum is σ = 39167856. Its totient is φ = 17044992.

The previous prime is 25857361. The next prime is 25857401. The reversal of 25857387 is 78375852.

It is not a de Polignac number, because 25857387 - 2¹⁵ = 25824619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25857287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23023 + ... + 24119.

It is an arithmetic number, because the mean of its divisors is an integer number (1631994).

Almost surely, 2^25857387 is an apocalyptic number.

25857387 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

25857387 is a deficient number, since it is larger than the sum of its proper divisors (13310469).

25857387 is an equidigital number, since it uses as much as digits as its factorization.

25857387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209 (or 1197 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 25857387 is about 5085.0159291786. The cubic root of 25857387 is about 295.7069590407.

It can be divided in two parts, 25857 and 387, that added together give a square (26244 = 162²).

The spelling of 25857387 in words is "twenty-five million, eight hundred fifty-seven thousand, three hundred eighty-seven".