999993972 has 24 divisors (see below), whose sum is σ = 2336422816. Its totient is φ = 332887968.

The previous prime is 999993971. The next prime is 999994003. The reversal of 999993972 is 279399999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999993971) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 45958 + ... + 64125.

Almost surely, 2^999993972 is an apocalyptic number.

It is an amenable number.

999993972 is an abundant number, since it is smaller than the sum of its proper divisors (1336428844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999993972 is a wasteful number, since it uses less digits than its factorization.

999993972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110847 (or 110845 counting only the distinct ones).

The product of its digits is 22320522, while the sum is 66.

The square root of 999993972 is about 31622.6812904915. The cubic root of 999993972 is about 999.9979906626.

The spelling of 999993972 in words is "nine hundred ninety-nine million, nine hundred ninety-three thousand, nine hundred seventy-two".