621693839 has 8 divisors (see below), whose sum is σ = 670514880. Its totient is φ = 573015456.

The previous prime is 621693833. The next prime is 621693847. The reversal of 621693839 is 938396126.

621693839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 621693839 - 2⁴ = 621693823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621693793 and 621693802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621693833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26519 + ... + 44120.

It is an arithmetic number, because the mean of its divisors is an integer number (83814360).

Almost surely, 2^621693839 is an apocalyptic number.

621693839 is a deficient number, since it is larger than the sum of its proper divisors (48821041).

621693839 is a wasteful number, since it uses less digits than its factorization.

621693839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71329.

The product of its digits is 419904, while the sum is 47.

The square root of 621693839 is about 24933.7891023406. The cubic root of 621693839 is about 853.4777189799.

The spelling of 621693839 in words is "six hundred twenty-one million, six hundred ninety-three thousand, eight hundred thirty-nine".