993213977 has 24 divisors (see below), whose sum is σ = 1191681216. Its totient is φ = 824771808.

The previous prime is 993213919. The next prime is 993213989. The reversal of 993213977 is 779312399.

It is not a de Polignac number, because 993213977 - 2⁶ = 993213913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (993213077) 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 23 ways as a sum of consecutive naturals, for example, 475778 + ... + 477860.

It is an arithmetic number, because the mean of its divisors is an integer number (49653384).

Almost surely, 2^993213977 is an apocalyptic number.

It is an amenable number.

993213977 is a deficient number, since it is larger than the sum of its proper divisors (198467239).

993213977 is a wasteful number, since it uses less digits than its factorization.

993213977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2397 (or 2390 counting only the distinct ones).

The product of its digits is 642978, while the sum is 50.

The square root of 993213977 is about 31515.2975077184. The cubic root of 993213977 is about 997.7328562770.

The spelling of 993213977 in words is "nine hundred ninety-three million, two hundred thirteen thousand, nine hundred seventy-seven".