25709838 has 48 divisors (see below), whose sum is σ = 64606080. Its totient is φ = 6676560.

The previous prime is 25709821. The next prime is 25709851. The reversal of 25709838 is 83890752.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 25709838.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2553 + ... + 7611.

It is an arithmetic number, because the mean of its divisors is an integer number (1345960).

Almost surely, 2^25709838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25709838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32303040).

25709838 is an abundant number, since it is smaller than the sum of its proper divisors (38896242).

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

25709838 is a wasteful number, since it uses less digits than its factorization.

25709838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5093 (or 5082 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 25709838 is about 5070.4869588630. The cubic root of 25709838 is about 295.1434254212.

The spelling of 25709838 in words is "twenty-five million, seven hundred nine thousand, eight hundred thirty-eight".