1789221640 has 32 divisors (see below), whose sum is σ = 4237632000. Its totient is φ = 678020544.

The previous prime is 1789221611. The next prime is 1789221649. The reversal of 1789221640 is 461229871.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1789221593 and 1789221602.

It is not an unprimeable number, because it can be changed into a prime (1789221649) 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, 1176360 + ... + 1177879.

It is an arithmetic number, because the mean of its divisors is an integer number (132426000).

Almost surely, 2^1789221640 is an apocalyptic number.

1789221640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1789221640 is an abundant number, since it is smaller than the sum of its proper divisors (2448410360).

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

1789221640 is a wasteful number, since it uses less digits than its factorization.

1789221640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2354269 (or 2354265 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1789221640 is about 42299.1919544570. The cubic root of 1789221640 is about 1214.0075306201.

The spelling of 1789221640 in words is "one billion, seven hundred eighty-nine million, two hundred twenty-one thousand, six hundred forty".