25000040 has 64 divisors (see below), whose sum is σ = 61205760. Its totient is φ = 9135360.

The previous prime is 25000033. The next prime is 25000069. The reversal of 25000040 is 4000052.

It is a sliding number, since 25000040 = 40 + 25000000 and 1/40 + 1/25000000 = 0.025000040.

It is a junction number, because it is equal to n+sod(n) for n = 24999985 and 25000030.

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, 67937 + ... + 68303.

It is an arithmetic number, because the mean of its divisors is an integer number (956340).

Almost surely, 2^25000040 is an apocalyptic number.

25000040 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 25000040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30602880).

25000040 is an abundant number, since it is smaller than the sum of its proper divisors (36205720).

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

25000040 is a wasteful number, since it uses less digits than its factorization.

25000040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 11.

The square root of 25000040 is about 5000.0039999984. The cubic root of 25000040 is about 292.4019297688.

Subtracting from 25000040 its product of nonzero digits (40), we obtain a square (25000000 = 5000²).

Adding to 25000040 its reverse (4000052), we get a palindrome (29000092).

It can be divided in two parts, 250000 and 40, that multiplied together give a 7-th power (10000000 = 10⁷).

The spelling of 25000040 in words is "twenty-five million, forty", and thus it is an aban number and an uban number.