77944219 has 2 divisors, whose sum is σ = 77944220. Its totient is φ = 77944218.

The previous prime is 77944193. The next prime is 77944267. The reversal of 77944219 is 91244977.

It is a weak prime.

It is an emirp because it is prime and its reverse (91244977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77944219 - 2⁵ = 77944187 is a prime.

It is a super-2 number, since 2×77944219² = 12150602551039922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77944019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38972109 + 38972110.

It is an arithmetic number, because the mean of its divisors is an integer number (38972110).

Almost surely, 2^77944219 is an apocalyptic number.

77944219 is a deficient number, since it is larger than the sum of its proper divisors (1).

77944219 is an equidigital number, since it uses as much as digits as its factorization.

77944219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 43.

The square root of 77944219 is about 8828.6023242640. The cubic root of 77944219 is about 427.1639920969.

The spelling of 77944219 in words is "seventy-seven million, nine hundred forty-four thousand, two hundred nineteen".