6997921 has 16 divisors (see below), whose sum is σ = 8426880. Its totient is φ = 5685120.

The previous prime is 6997901. The next prime is 6997927. The reversal of 6997921 is 1297996.

It is not a de Polignac number, because 6997921 - 2¹³ = 6989729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6997927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10290 + ... + 10948.

It is an arithmetic number, because the mean of its divisors is an integer number (526680).

Almost surely, 2^6997921 is an apocalyptic number.

It is an amenable number.

6997921 is a deficient number, since it is larger than the sum of its proper divisors (1428959).

6997921 is a wasteful number, since it uses less digits than its factorization.

6997921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744.

The product of its digits is 61236, while the sum is 43.

The square root of 6997921 is about 2645.3583878182. The cubic root of 6997921 is about 191.2741783834.

The spelling of 6997921 in words is "six million, nine hundred ninety-seven thousand, nine hundred twenty-one".