1983993890 has 16 divisors (see below), whose sum is σ = 3629734200. Its totient is φ = 780587520.

The previous prime is 1983993887. The next prime is 1983993937. The reversal of 1983993890 is 983993891.

It can be written as a sum of positive squares in 4 ways, for example, as 398281849 + 1585712041 = 19957^2 + 39821^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1625615 + ... + 1626834.

Almost surely, 2^1983993890 is an apocalyptic number.

1983993890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1983993890 is a deficient number, since it is larger than the sum of its proper divisors (1645740310).

1983993890 is a wasteful number, since it uses less digits than its factorization.

1983993890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3252517.

The product of its (nonzero) digits is 3779136, while the sum is 59.

The square root of 1983993890 is about 44542.0463158127. The cubic root of 1983993890 is about 1256.5509710469.

Subtracting from 1983993890 its reverse (983993891), we obtain a palindrome (999999999).

The spelling of 1983993890 in words is "one billion, nine hundred eighty-three million, nine hundred ninety-three thousand, eight hundred ninety".