25998420 has 144 divisors (see below), whose sum is σ = 87333120. Its totient is φ = 5757696.

The previous prime is 25998407. The next prime is 25998431. The reversal of 25998420 is 2489952.

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 47 ways as a sum of consecutive naturals, for example, 108661 + ... + 108899.

It is an arithmetic number, because the mean of its divisors is an integer number (606480).

Almost surely, 2^25998420 is an apocalyptic number.

25998420 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 25998420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43666560).

25998420 is an abundant number, since it is smaller than the sum of its proper divisors (61334700).

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

25998420 is a wasteful number, since it uses less digits than its factorization.

25998420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 25998420 is about 5098.8645794922. The cubic root of 25998420 is about 296.2436057656.

The spelling of 25998420 in words is "twenty-five million, nine hundred ninety-eight thousand, four hundred twenty".