74369209 has 2 divisors, whose sum is σ = 74369210. Its totient is φ = 74369208.

The previous prime is 74369171. The next prime is 74369213. The reversal of 74369209 is 90296347.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38787984 + 35581225 = 6228^2 + 5965^2 .

It is an emirp because it is prime and its reverse (90296347) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74369209 - 2⁷ = 74369081 is a prime.

It is a super-3 number, since 3×74369209³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (74369219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37184604 + 37184605.

It is an arithmetic number, because the mean of its divisors is an integer number (37184605).

Almost surely, 2^74369209 is an apocalyptic number.

It is an amenable number.

74369209 is a deficient number, since it is larger than the sum of its proper divisors (1).

74369209 is an equidigital number, since it uses as much as digits as its factorization.

74369209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 74369209 is about 8623.7584033877. The cubic root of 74369209 is about 420.5307142139.

The spelling of 74369209 in words is "seventy-four million, three hundred sixty-nine thousand, two hundred nine".