25851420 has 144 divisors (see below), whose sum is σ = 93653280. Its totient is φ = 5902848.

The previous prime is 25851401. The next prime is 25851437. The reversal of 25851420 is 2415852.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25972 + ... + 26948.

It is an arithmetic number, because the mean of its divisors is an integer number (650370).

Almost surely, 2^25851420 is an apocalyptic number.

25851420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25851420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46826640).

25851420 is an abundant number, since it is smaller than the sum of its proper divisors (67801860).

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

25851420 is a wasteful number, since it uses less digits than its factorization.

25851420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009 (or 994 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 25851420 is about 5084.4291715000. The cubic root of 25851420 is about 295.6842109421.

It can be divided in two parts, 2585 and 1420, that added together give a triangular number (4005 = T₈₉).

The spelling of 25851420 in words is "twenty-five million, eight hundred fifty-one thousand, four hundred twenty".