1836393990 has 64 divisors (see below), whose sum is σ = 4533836544. Its totient is φ = 475694208.

The previous prime is 1836393983. The next prime is 1836394013. The reversal of 1836393990 is 993936381.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1050297 + ... + 1052043.

It is an arithmetic number, because the mean of its divisors is an integer number (70841196).

Almost surely, 2^1836393990 is an apocalyptic number.

1836393990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1836393990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2266918272).

1836393990 is an abundant number, since it is smaller than the sum of its proper divisors (2697442554).

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

1836393990 is a wasteful number, since it uses less digits than its factorization.

1836393990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2741.

The product of its (nonzero) digits is 944784, while the sum is 51.

The square root of 1836393990 is about 42853.1677942250. The cubic root of 1836393990 is about 1224.5841131611.

The spelling of 1836393990 in words is "one billion, eight hundred thirty-six million, three hundred ninety-three thousand, nine hundred ninety".