25021830 has 32 divisors (see below), whose sum is σ = 61189344. Its totient is φ = 6546176.

The previous prime is 25021819. The next prime is 25021831. The reversal of 25021830 is 3812052.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25021797 and 25021806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25021831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6279 + ... + 9458.

It is an arithmetic number, because the mean of its divisors is an integer number (1912167).

Almost surely, 2^25021830 is an apocalyptic number.

25021830 is an abundant number, since it is smaller than the sum of its proper divisors (36167514).

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

25021830 is a wasteful number, since it uses less digits than its factorization.

25021830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15800.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 25021830 is about 5002.1825236590. The cubic root of 25021830 is about 292.4868574707.

Adding to 25021830 its reverse (3812052), we get a palindrome (28833882).

The spelling of 25021830 in words is "twenty-five million, twenty-one thousand, eight hundred thirty".