999921950 has 24 divisors (see below), whose sum is σ = 1862460408. Its totient is φ = 399408480.

The previous prime is 999921947. The next prime is 999921977. The reversal of 999921950 is 59129999.

It is a junction number, because it is equal to n+sod(n) for n = 999921892 and 999921901.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23009 + ... + 50291.

It is an arithmetic number, because the mean of its divisors is an integer number (77602517).

Almost surely, 2^999921950 is an apocalyptic number.

999921950 is a deficient number, since it is larger than the sum of its proper divisors (862538458).

999921950 is a wasteful number, since it uses less digits than its factorization.

999921950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28028 (or 28023 counting only the distinct ones).

The product of its (nonzero) digits is 590490, while the sum is 53.

The square root of 999921950 is about 31621.5424987460. The cubic root of 999921950 is about 999.9739826564.

The spelling of 999921950 in words is "nine hundred ninety-nine million, nine hundred twenty-one thousand, nine hundred fifty".