621994793 has 8 divisors (see below), whose sum is σ = 752666112. Its totient is φ = 501777216.

The previous prime is 621994787. The next prime is 621994801. The reversal of 621994793 is 397499126.

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

It is a cyclic number.

It is not a de Polignac number, because 621994793 - 2⁸ = 621994537 is a prime.

It is a super-2 number, since 2×621994793² = 773755045038225698, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (621994783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2613305 + ... + 2613542.

It is an arithmetic number, because the mean of its divisors is an integer number (94083264).

Almost surely, 2^621994793 is an apocalyptic number.

It is an amenable number.

621994793 is a deficient number, since it is larger than the sum of its proper divisors (130671319).

621994793 is a wasteful number, since it uses less digits than its factorization.

621994793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5226871.

The product of its digits is 734832, while the sum is 50.

The square root of 621994793 is about 24939.8234356220. The cubic root of 621994793 is about 853.6154159626.

The spelling of 621994793 in words is "six hundred twenty-one million, nine hundred ninety-four thousand, seven hundred ninety-three".