999921952 has 24 divisors (see below), whose sum is σ = 1983632112. Its totient is φ = 496142400.

The previous prime is 999921947. The next prime is 999921977. The reversal of 999921952 is 259129999.

It is a junction number, because it is equal to n+sod(n) for n = 999921893 and 999921902.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115074 + ... + 123457.

It is an arithmetic number, because the mean of its divisors is an integer number (82651338).

Almost surely, 2^999921952 is an apocalyptic number.

It is an amenable number.

999921952 is a deficient number, since it is larger than the sum of its proper divisors (983710160).

999921952 is a wasteful number, since it uses less digits than its factorization.

999921952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238672 (or 238664 counting only the distinct ones).

The product of its digits is 1180980, while the sum is 55.

The square root of 999921952 is about 31621.5425303700. The cubic root of 999921952 is about 999.9739833231.

The spelling of 999921952 in words is "nine hundred ninety-nine million, nine hundred twenty-one thousand, nine hundred fifty-two".