76389221 has 2 divisors, whose sum is σ = 76389222. Its totient is φ = 76389220.

The previous prime is 76389217. The next prime is 76389227. The reversal of 76389221 is 12298367.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51638596 + 24750625 = 7186^2 + 4975^2 .

It is an emirp because it is prime and its reverse (12298367) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76389221 - 2² = 76389217 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76389227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38194610 + 38194611.

It is an arithmetic number, because the mean of its divisors is an integer number (38194611).

Almost surely, 2^76389221 is an apocalyptic number.

It is an amenable number.

76389221 is a deficient number, since it is larger than the sum of its proper divisors (1).

76389221 is an equidigital number, since it uses as much as digits as its factorization.

76389221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 76389221 is about 8740.0927340618. The cubic root of 76389221 is about 424.3042290433.

The spelling of 76389221 in words is "seventy-six million, three hundred eighty-nine thousand, two hundred twenty-one".