6938721 has 24 divisors (see below), whose sum is σ = 10480704. Its totient is φ = 4419360.

The previous prime is 6938719. The next prime is 6938731. The reversal of 6938721 is 1278396.

It is not a de Polignac number, because 6938721 - 2¹ = 6938719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6938731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22156 + ... + 22466.

It is an arithmetic number, because the mean of its divisors is an integer number (436696).

Almost surely, 2^6938721 is an apocalyptic number.

It is an amenable number.

6938721 is a deficient number, since it is larger than the sum of its proper divisors (3541983).

6938721 is a wasteful number, since it uses less digits than its factorization.

6938721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 418 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 6938721 is about 2634.1452123981. The cubic root of 6938721 is about 190.7332790193.

The spelling of 6938721 in words is "six million, nine hundred thirty-eight thousand, seven hundred twenty-one".