1825388820 has 72 divisors (see below), whose sum is σ = 5654847744. Its totient is φ = 476411328.

The previous prime is 1825388819. The next prime is 1825388833. The reversal of 1825388820 is 288835281.

1825388820 is a `hidden beast` number, since 18 + 2 + 538 + 88 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99424 + ... + 116343.

It is an arithmetic number, because the mean of its divisors is an integer number (78539552).

Almost surely, 2^1825388820 is an apocalyptic number.

1825388820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1825388820 is an abundant number, since it is smaller than the sum of its proper divisors (3829458924).

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

1825388820 is a wasteful number, since it uses less digits than its factorization.

1825388820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215829 (or 215824 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 45.

The square root of 1825388820 is about 42724.5692781098. The cubic root of 1825388820 is about 1222.1329747443.

The spelling of 1825388820 in words is "one billion, eight hundred twenty-five million, three hundred eighty-eight thousand, eight hundred twenty".