1939999999 has 8 divisors (see below), whose sum is σ = 2347563168. Its totient is φ = 1565041920.

The previous prime is 1939999991. The next prime is 1940000003. The reversal of 1939999999 is 9999999391.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1939999999 - 2³ = 1939999991 is a prime.

It is a super-2 number, since 2×1939999999² = 7527199992240000002, which contains 22 as substring.

It is a Duffinian number.

1939999999 is a modest number, since divided by 99999 gives 19399 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1939999991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8151142 + ... + 8151379.

It is an arithmetic number, because the mean of its divisors is an integer number (293445396).

Almost surely, 2^1939999999 is an apocalyptic number.

1939999999 is a deficient number, since it is larger than the sum of its proper divisors (407563169).

1939999999 is a wasteful number, since it uses less digits than its factorization.

1939999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16302545.

The product of its digits is 129140163, while the sum is 76.

The square root of 1939999999 is about 44045.4310797386. The cubic root of 1939999999 is about 1247.1937042648.

The spelling of 1939999999 in words is "one billion, nine hundred thirty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".