74842139 has 2 divisors, whose sum is σ = 74842140. Its totient is φ = 74842138.

The previous prime is 74842099. The next prime is 74842213. The reversal of 74842139 is 93124847.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74842139 is a prime.

It is not a weakly prime, because it can be changed into another prime (74842039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37421069 + 37421070.

It is an arithmetic number, because the mean of its divisors is an integer number (37421070).

Almost surely, 2^74842139 is an apocalyptic number.

74842139 is a deficient number, since it is larger than the sum of its proper divisors (1).

74842139 is an equidigital number, since it uses as much as digits as its factorization.

74842139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 74842139 is about 8651.1351278315. The cubic root of 74842139 is about 421.4202467652.

The spelling of 74842139 in words is "seventy-four million, eight hundred forty-two thousand, one hundred thirty-nine".