25871406 has 32 divisors (see below), whose sum is σ = 57252096. Its totient is φ = 7728000.

The previous prime is 25871387. The next prime is 25871411. The reversal of 25871406 is 60417852.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1926 + ... + 7446.

It is an arithmetic number, because the mean of its divisors is an integer number (1789128).

Almost surely, 2^25871406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25871406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28626048).

25871406 is an abundant number, since it is smaller than the sum of its proper divisors (31380690).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25871406 is a wasteful number, since it uses less digits than its factorization.

25871406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5608.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 25871406 is about 5086.3942041489. The cubic root of 25871406 is about 295.7603901537.

It can be divided in two parts, 2587 and 1406, that added together give a palindrome (3993).

The spelling of 25871406 in words is "twenty-five million, eight hundred seventy-one thousand, four hundred six".