1899339981 has 64 divisors (see below), whose sum is σ = 3296741376. Its totient is φ = 944006400.

The previous prime is 1899339979. The next prime is 1899340013.

1899339981 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1899339981 - 2¹ = 1899339979 is a prime.

It is a super-2 number, since 2×1899339981² = 7214984726850160722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1899339881) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 519546 + ... + 523188.

It is an arithmetic number, because the mean of its divisors is an integer number (51511584).

Almost surely, 2^1899339981 is an apocalyptic number.

1899339981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1899339981 is a deficient number, since it is larger than the sum of its proper divisors (1397401395).

1899339981 is a wasteful number, since it uses less digits than its factorization.

1899339981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3762.

The product of its digits is 3779136, while the sum is 60.

The square root of 1899339981 is about 43581.4178406348. The cubic root of 1899339981 is about 1238.4188964115.

The spelling of 1899339981 in words is "one billion, eight hundred ninety-nine million, three hundred thirty-nine thousand, nine hundred eighty-one".