1840021899 has 16 divisors (see below), whose sum is σ = 2539468800. Its totient is φ = 1183678496.

The previous prime is 1840021889. The next prime is 1840021907. The reversal of 1840021899 is 9981200481.

It is a cyclic number.

It is not a de Polignac number, because 1840021899 - 2¹⁵ = 1839989131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1840021899.

It is not an unprimeable number, because it can be changed into a prime (1840021819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168982 + ... + 179540.

It is an arithmetic number, because the mean of its divisors is an integer number (158716800).

Almost surely, 2^1840021899 is an apocalyptic number.

1840021899 is a deficient number, since it is larger than the sum of its proper divisors (699446901).

1840021899 is a wasteful number, since it uses less digits than its factorization.

1840021899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12594.

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 1840021899 is about 42895.4764398299. The cubic root of 1840021899 is about 1225.3899963867.

The spelling of 1840021899 in words is "one billion, eight hundred forty million, twenty-one thousand, eight hundred ninety-nine".