6412721 has 4 divisors (see below), whose sum is σ = 7328832. Its totient is φ = 5496612.

The previous prime is 6412669. The next prime is 6412739. The reversal of 6412721 is 1272146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1272146 = 2 ⋅636073.

It is a cyclic number.

It is not a de Polignac number, because 6412721 - 2⁶ = 6412657 is a prime.

It is a super-2 number, since 2×6412721² = 82245981247682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6412781) 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, 458045 + ... + 458058.

It is an arithmetic number, because the mean of its divisors is an integer number (1832208).

Almost surely, 2^6412721 is an apocalyptic number.

It is an amenable number.

6412721 is a deficient number, since it is larger than the sum of its proper divisors (916111).

6412721 is an equidigital number, since it uses as much as digits as its factorization.

6412721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916110.

The product of its digits is 672, while the sum is 23.

The square root of 6412721 is about 2532.3350884115. The cubic root of 6412721 is about 185.7864837068.

Adding to 6412721 its reverse (1272146), we get a palindrome (7684867).

The spelling of 6412721 in words is "six million, four hundred twelve thousand, seven hundred twenty-one".