6739398621 has 24 divisors (see below), whose sum is σ = 10386028224. Its totient is φ = 4196350080.

The previous prime is 6739398599. The next prime is 6739398641. The reversal of 6739398621 is 1268939376.

6739398621 is a `hidden beast` number, since 6 + 7 + 3 + 9 + 3 + 9 + 8 + 621 = 666.

It is not a de Polignac number, because 6739398621 - 2²¹ = 6737301469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6739398641) 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 23 ways as a sum of consecutive naturals, for example, 148081 + ... + 188166.

It is an arithmetic number, because the mean of its divisors is an integer number (432751176).

Almost surely, 2^6739398621 is an apocalyptic number.

It is an amenable number.

6739398621 is a deficient number, since it is larger than the sum of its proper divisors (3646629603).

6739398621 is a wasteful number, since it uses less digits than its factorization.

6739398621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336401 (or 336398 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 6739398621 is about 82093.8403353138. The cubic root of 6739398621 is about 1888.8916563729.

The spelling of 6739398621 in words is "six billion, seven hundred thirty-nine million, three hundred ninety-eight thousand, six hundred twenty-one".