1999893919 has 4 divisors (see below), whose sum is σ = 2053945144. Its totient is φ = 1945842696.

The previous prime is 1999893899. The next prime is 1999893983. The reversal of 1999893919 is 9193989991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9193989991 = 317 ⋅29003123.

It is a cyclic number.

It is not a de Polignac number, because 1999893919 - 2¹⁵ = 1999861151 is a prime.

It is a super-2 number, since 2×1999893919² = 7999151374506357122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999893989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27025557 + ... + 27025630.

It is an arithmetic number, because the mean of its divisors is an integer number (513486286).

Almost surely, 2^1999893919 is an apocalyptic number.

1999893919 is a deficient number, since it is larger than the sum of its proper divisors (54051225).

1999893919 is an equidigital number, since it uses as much as digits as its factorization.

1999893919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54051224.

The product of its digits is 12754584, while the sum is 67.

The square root of 1999893919 is about 44720.1735126330. The cubic root of 1999893919 is about 1259.8987738869.

The spelling of 1999893919 in words is "one billion, nine hundred ninety-nine million, eight hundred ninety-three thousand, nine hundred nineteen".