74304389 has 2 divisors, whose sum is σ = 74304390. Its totient is φ = 74304388.

The previous prime is 74304371. The next prime is 74304403. The reversal of 74304389 is 98340347.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57123364 + 17181025 = 7558^2 + 4145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74304389 is a prime.

It is a super-2 number, since 2×74304389² = 11042284449326642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74304089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37152194 + 37152195.

It is an arithmetic number, because the mean of its divisors is an integer number (37152195).

Almost surely, 2^74304389 is an apocalyptic number.

It is an amenable number.

74304389 is a deficient number, since it is larger than the sum of its proper divisors (1).

74304389 is an equidigital number, since it uses as much as digits as its factorization.

74304389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 74304389 is about 8619.9993619489. Note that the first 3 decimals coincide. The cubic root of 74304389 is about 420.4085008917.

The spelling of 74304389 in words is "seventy-four million, three hundred four thousand, three hundred eighty-nine".