25380840 has 32 divisors (see below), whose sum is σ = 76142880. Its totient is φ = 6768192.

The previous prime is 25380833. The next prime is 25380841. The reversal of 25380840 is 4808352.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 25380798 and 25380807.

It is not an unprimeable number, because it can be changed into a prime (25380841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105634 + ... + 105873.

It is an arithmetic number, because the mean of its divisors is an integer number (2379465).

Almost surely, 2^25380840 is an apocalyptic number.

25380840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25380840 is an abundant number, since it is smaller than the sum of its proper divisors (50762040).

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

25380840 is a wasteful number, since it uses less digits than its factorization.

25380840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211521 (or 211517 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 25380840 is about 5037.9400552210. The cubic root of 25380840 is about 293.8790747079.

The spelling of 25380840 in words is "twenty-five million, three hundred eighty thousand, eight hundred forty".