25139040 has 96 divisors (see below), whose sum is σ = 80269056. Its totient is φ = 6612480.

The previous prime is 25139017. The next prime is 25139053. The reversal of 25139040 is 4093152.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 25139040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39525 + ... + 40155.

It is an arithmetic number, because the mean of its divisors is an integer number (836136).

Almost surely, 2^25139040 is an apocalyptic number.

25139040 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 25139040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40134528).

25139040 is an abundant number, since it is smaller than the sum of its proper divisors (55130016).

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

25139040 is a wasteful number, since it uses less digits than its factorization.

25139040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732 (or 724 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 25139040 is about 5013.8847214510. The cubic root of 25139040 is about 292.9428458839.

The spelling of 25139040 in words is "twenty-five million, one hundred thirty-nine thousand, forty".