74644139 has 2 divisors, whose sum is σ = 74644140. Its totient is φ = 74644138.

The previous prime is 74644117. The next prime is 74644159. The reversal of 74644139 is 93144647.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 74644139 - 2¹² = 74640043 is a prime.

It is not a weakly prime, because it can be changed into another prime (74644109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37322069 + 37322070.

It is an arithmetic number, because the mean of its divisors is an integer number (37322070).

Almost surely, 2^74644139 is an apocalyptic number.

74644139 is a deficient number, since it is larger than the sum of its proper divisors (1).

74644139 is an equidigital number, since it uses as much as digits as its factorization.

74644139 is an evil number, because the sum of its binary digits is even.

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

The square root of 74644139 is about 8639.6839641274. The cubic root of 74644139 is about 421.0482865234.

The spelling of 74644139 in words is "seventy-four million, six hundred forty-four thousand, one hundred thirty-nine".