999758972 has 6 divisors (see below), whose sum is σ = 1749578208. Its totient is φ = 499879484.

The previous prime is 999758971. The next prime is 999758989. The reversal of 999758972 is 279857999.

It is a junction number, because it is equal to n+sod(n) for n = 999758899 and 999758908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999758971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124969868 + ... + 124969875.

It is an arithmetic number, because the mean of its divisors is an integer number (291596368).

Almost surely, 2^999758972 is an apocalyptic number.

It is an amenable number.

999758972 is a deficient number, since it is larger than the sum of its proper divisors (749819236).

999758972 is a wasteful number, since it uses less digits than its factorization.

999758972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249939747 (or 249939745 counting only the distinct ones).

The product of its digits is 25719120, while the sum is 65.

The square root of 999758972 is about 31618.9653847181. The cubic root of 999758972 is about 999.9196508775.

The spelling of 999758972 in words is "nine hundred ninety-nine million, seven hundred fifty-eight thousand, nine hundred seventy-two".