1999143 has 6 divisors (see below), whose sum is σ = 2887664. Its totient is φ = 1332756.

The previous prime is 1999121. The next prime is 1999163. The reversal of 1999143 is 3419991.

It is not a de Polignac number, because 1999143 - 2⁵ = 1999111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1999098 and 1999107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111055 + ... + 111072.

2^1999143 is an apocalyptic number.

1999143 is a deficient number, since it is larger than the sum of its proper divisors (888521).

1999143 is a wasteful number, since it uses less digits than its factorization.

1999143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222133 (or 222130 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 1999143 is about 1413.9105346520. The cubic root of 1999143 is about 125.9741065461.

The spelling of 1999143 in words is "one million, nine hundred ninety-nine thousand, one hundred forty-three".