6624397 has 4 divisors (see below), whose sum is σ = 7133980. Its totient is φ = 6114816.

The previous prime is 6624379. The next prime is 6624413. The reversal of 6624397 is 7934266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7934266 = 2 ⋅3967133.

It can be written as a sum of positive squares in 2 ways, for example, as 3575881 + 3048516 = 1891^2 + 1746^2 .

It is a cyclic number.

It is not a de Polignac number, because 6624397 - 2⁷ = 6624269 is a prime.

It is a super-2 number, since 2×6624397² = 87765271227218, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6⁶ + 6⁷ + 2⁹ + 4⁵ + 3³ + 9⁶ + 7⁸ .

It is a Duffinian number.

6624397 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6624307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254772 + ... + 254797.

It is an arithmetic number, because the mean of its divisors is an integer number (1783495).

Almost surely, 2^6624397 is an apocalyptic number.

It is an amenable number.

6624397 is a deficient number, since it is larger than the sum of its proper divisors (509583).

6624397 is a wasteful number, since it uses less digits than its factorization.

6624397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509582.

The product of its digits is 54432, while the sum is 37.

The square root of 6624397 is about 2573.7903955062. The cubic root of 6624397 is about 187.8085893235.

It can be divided in two parts, 6624 and 397, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 6624397 in words is "six million, six hundred twenty-four thousand, three hundred ninety-seven".