999999999743972 has 24 divisors (see below), whose sum is σ = 1768703178305280. Its totient is φ = 494660094232320.

The previous prime is 999999999743971. The next prime is 999999999744061. The reversal of 999999999743972 is 279347999999999.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (999999999743971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481427072 + ... + 483499767.

It is an arithmetic number, because the mean of its divisors is an integer number (73695965762720).

Almost surely, 2^{999999999743972} is an apocalyptic number.

It is an amenable number.

999999999743972 is a deficient number, since it is larger than the sum of its proper divisors (768703178561308).

999999999743972 is a wasteful number, since it uses less digits than its factorization.

999999999743972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964929611 (or 964929609 counting only the distinct ones).

The product of its digits is 4100458455576, while the sum is 113.

The spelling of 999999999743972 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, seven hundred forty-three thousand, nine hundred seventy-two".