1982178220 has 24 divisors (see below), whose sum is σ = 4540990608. Its totient is φ = 720792000.

The previous prime is 1982178193. The next prime is 1982178221. The reversal of 1982178220 is 228712891.

It is not an unprimeable number, because it can be changed into a prime (1982178221) 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, 4504731 + ... + 4505170.

It is an arithmetic number, because the mean of its divisors is an integer number (189207942).

Almost surely, 2^1982178220 is an apocalyptic number.

1982178220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1982178220 is an abundant number, since it is smaller than the sum of its proper divisors (2558812388).

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

1982178220 is a wasteful number, since it uses less digits than its factorization.

1982178220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9009921 (or 9009919 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 1982178220 is about 44521.6601217879. The cubic root of 1982178220 is about 1256.1675393841.

The spelling of 1982178220 in words is "one billion, nine hundred eighty-two million, one hundred seventy-eight thousand, two hundred twenty".