994423993 has 4 divisors (see below), whose sum is σ = 1052919540. Its totient is φ = 935928448.

The previous prime is 994423973. The next prime is 994423999. The reversal of 994423993 is 399324499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399324499 = 7 ⋅57046357.

It can be written as a sum of positive squares in 2 ways, for example, as 300259584 + 694164409 = 17328^2 + 26347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-994423993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 994423993.

It is not an unprimeable number, because it can be changed into a prime (994423999) 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 3 ways as a sum of consecutive naturals, for example, 29247748 + ... + 29247781.

It is an arithmetic number, because the mean of its divisors is an integer number (263229885).

Almost surely, 2^994423993 is an apocalyptic number.

It is an amenable number.

994423993 is a deficient number, since it is larger than the sum of its proper divisors (58495547).

994423993 is a wasteful number, since it uses less digits than its factorization.

994423993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58495546.

The product of its digits is 1889568, while the sum is 52.

The square root of 994423993 is about 31534.4889446460. The cubic root of 994423993 is about 998.1378656079.

The spelling of 994423993 in words is "nine hundred ninety-four million, four hundred twenty-three thousand, nine hundred ninety-three".