1983821790 has 32 divisors (see below), whose sum is σ = 4766086656. Its totient is φ = 528473120.

The previous prime is 1983821759. The next prime is 1983821867. The reversal of 1983821790 is 971283891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4146 + ... + 63125.

It is an arithmetic number, because the mean of its divisors is an integer number (148940208).

Almost surely, 2^1983821790 is an apocalyptic number.

1983821790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1983821790 is an abundant number, since it is smaller than the sum of its proper divisors (2782264866).

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

1983821790 is a wasteful number, since it uses less digits than its factorization.

1983821790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68264.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 1983821790 is about 44540.1143914113. The cubic root of 1983821790 is about 1256.5146371522.

The spelling of 1983821790 in words is "one billion, nine hundred eighty-three million, eight hundred twenty-one thousand, seven hundred ninety".