993721894 has 8 divisors (see below), whose sum is σ = 1626090408. Its totient is φ = 451691760.

The previous prime is 993721891. The next prime is 993721921. The reversal of 993721894 is 498127399.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×993721894³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993721891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22584567 + ... + 22584610.

It is an arithmetic number, because the mean of its divisors is an integer number (203261301).

Almost surely, 2^993721894 is an apocalyptic number.

993721894 is a deficient number, since it is larger than the sum of its proper divisors (632368514).

993721894 is a wasteful number, since it uses less digits than its factorization.

993721894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45169190.

The product of its digits is 979776, while the sum is 52.

The square root of 993721894 is about 31523.3547389868. The cubic root of 993721894 is about 997.9029032595.

The spelling of 993721894 in words is "nine hundred ninety-three million, seven hundred twenty-one thousand, eight hundred ninety-four".