6890621 has 16 divisors (see below), whose sum is σ = 7463808. Its totient is φ = 6350400.

The previous prime is 6890591. The next prime is 6890633. The reversal of 6890621 is 1260986.

6890621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 6890621 - 2¹⁸ = 6628477 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6890641) 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, 97016 + ... + 97086.

It is an arithmetic number, because the mean of its divisors is an integer number (466488).

Almost surely, 2^6890621 is an apocalyptic number.

6890621 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6890621 is a deficient number, since it is larger than the sum of its proper divisors (573187).

6890621 is a wasteful number, since it uses less digits than its factorization.

6890621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 6890621 is about 2624.9992380951. Note that the first 3 decimals coincide. The cubic root of 6890621 is about 190.2915284542.

The spelling of 6890621 in words is "six million, eight hundred ninety thousand, six hundred twenty-one".