6645397 has 8 divisors (see below), whose sum is σ = 7274592. Its totient is φ = 6020400.

The previous prime is 6645391. The next prime is 6645461. The reversal of 6645397 is 7935466.

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 6645397 - 2³ = 6645389 is a prime.

It is a super-2 number, since 2×6645397² = 88322602575218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645391) 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, 2947 + ... + 4687.

It is an arithmetic number, because the mean of its divisors is an integer number (909324).

Almost surely, 2^6645397 is an apocalyptic number.

It is an amenable number.

6645397 is a deficient number, since it is larger than the sum of its proper divisors (629195).

6645397 is a wasteful number, since it uses less digits than its factorization.

6645397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099.

The product of its digits is 136080, while the sum is 40.

The square root of 6645397 is about 2577.8667537326. The cubic root of 6645397 is about 188.0068373098.

The spelling of 6645397 in words is "six million, six hundred forty-five thousand, three hundred ninety-seven".