999972143 has 8 divisors (see below), whose sum is σ = 1009610448. Its totient is φ = 990347904.

The previous prime is 999972107. The next prime is 999972167. The reversal of 999972143 is 341279999.

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 999972143 - 2²⁰ = 998923567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999972443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188696 + ... + 193922.

It is an arithmetic number, because the mean of its divisors is an integer number (126201306).

Almost surely, 2^999972143 is an apocalyptic number.

999972143 is a deficient number, since it is larger than the sum of its proper divisors (9638305).

999972143 is a wasteful number, since it uses less digits than its factorization.

999972143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7033.

The product of its digits is 1102248, while the sum is 53.

The square root of 999972143 is about 31622.3361407724. The cubic root of 999972143 is about 999.9907142471.

The spelling of 999972143 in words is "nine hundred ninety-nine million, nine hundred seventy-two thousand, one hundred forty-three".