6897621 has 8 divisors (see below), whose sum is σ = 9514080. Its totient is φ = 4439792.

The previous prime is 6897607. The next prime is 6897637. The reversal of 6897621 is 1267986.

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

It is a cyclic number.

It is not a de Polignac number, because 6897621 - 2⁶ = 6897557 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 6897621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6897641) 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, 39555 + ... + 39728.

It is an arithmetic number, because the mean of its divisors is an integer number (1189260).

Almost surely, 2^6897621 is an apocalyptic number.

It is an amenable number.

6897621 is a deficient number, since it is larger than the sum of its proper divisors (2616459).

6897621 is a wasteful number, since it uses less digits than its factorization.

6897621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79315.

The product of its digits is 36288, while the sum is 39.

The square root of 6897621 is about 2626.3322333627. The cubic root of 6897621 is about 190.3559440268.

The spelling of 6897621 in words is "six million, eight hundred ninety-seven thousand, six hundred twenty-one".