993693621 has 8 divisors (see below), whose sum is σ = 1327944640. Its totient is φ = 660952512.

The previous prime is 993693607. The next prime is 993693629. The reversal of 993693621 is 126396399.

It is a happy number.

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

It is not a de Polignac number, because 993693621 - 2²² = 989499317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993693629) 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 7 ways as a sum of consecutive naturals, for example, 375940 + ... + 378573.

It is an arithmetic number, because the mean of its divisors is an integer number (165993080).

Almost surely, 2^993693621 is an apocalyptic number.

It is an amenable number.

993693621 is a deficient number, since it is larger than the sum of its proper divisors (334251019).

993693621 is a wasteful number, since it uses less digits than its factorization.

993693621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754955.

The product of its digits is 472392, while the sum is 48.

The square root of 993693621 is about 31522.9062905056. The cubic root of 993693621 is about 997.8934391842.

The spelling of 993693621 in words is "nine hundred ninety-three million, six hundred ninety-three thousand, six hundred twenty-one".