993820947 has 16 divisors (see below), whose sum is σ = 1514963712. Its totient is φ = 567684000.

The previous prime is 993820939. The next prime is 993821047. The reversal of 993820947 is 749028399.

It is not a de Polignac number, because 993820947 - 2³ = 993820939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 993820947.

It is not an unprimeable number, because it can be changed into a prime (993820747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60993 + ... + 75549.

It is an arithmetic number, because the mean of its divisors is an integer number (94685232).

Almost surely, 2^993820947 is an apocalyptic number.

993820947 is a deficient number, since it is larger than the sum of its proper divisors (521142765).

993820947 is a wasteful number, since it uses less digits than its factorization.

993820947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17818.

The product of its (nonzero) digits is 979776, while the sum is 51.

The square root of 993820947 is about 31524.9258048294. The cubic root of 993820947 is about 997.9360587439.

The spelling of 993820947 in words is "nine hundred ninety-three million, eight hundred twenty thousand, nine hundred forty-seven".