6238721 has 2 divisors, whose sum is σ = 6238722. Its totient is φ = 6238720.

The previous prime is 6238703. The next prime is 6238723. The reversal of 6238721 is 1278326.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5125696 + 1113025 = 2264^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 6238721 - 2¹⁸ = 5976577 is a prime.

Together with 6238723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6238723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3119360 + 3119361.

It is an arithmetic number, because the mean of its divisors is an integer number (3119361).

Almost surely, 2^6238721 is an apocalyptic number.

It is an amenable number.

6238721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6238721 is an equidigital number, since it uses as much as digits as its factorization.

6238721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 6238721 is about 2497.7431813539. The cubic root of 6238721 is about 184.0907023668.

It can be divided in two parts, 62 and 38721, that added together give a palindrome (38783).

The spelling of 6238721 in words is "six million, two hundred thirty-eight thousand, seven hundred twenty-one".