74447819 has 2 divisors, whose sum is σ = 74447820. Its totient is φ = 74447818.

The previous prime is 74447797. The next prime is 74447827. The reversal of 74447819 is 91874447.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74447819 is a prime.

It is a super-2 number, since 2×74447819² = 11084955507713522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74447819.

It is not a weakly prime, because it can be changed into another prime (74447899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37223909 + 37223910.

It is an arithmetic number, because the mean of its divisors is an integer number (37223910).

Almost surely, 2^74447819 is an apocalyptic number.

74447819 is a deficient number, since it is larger than the sum of its proper divisors (1).

74447819 is an equidigital number, since it uses as much as digits as its factorization.

74447819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 44.

The square root of 74447819 is about 8628.3149571628. The cubic root of 74447819 is about 420.6788323175.

The spelling of 74447819 in words is "seventy-four million, four hundred forty-seven thousand, eight hundred nineteen".