74287139 has 2 divisors, whose sum is σ = 74287140. Its totient is φ = 74287138.

The previous prime is 74287117. The next prime is 74287153. The reversal of 74287139 is 93178247.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 74287139 - 2¹² = 74283043 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 74287096 and 74287105.

It is not a weakly prime, because it can be changed into another prime (74287189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37143569 + 37143570.

It is an arithmetic number, because the mean of its divisors is an integer number (37143570).

Almost surely, 2^74287139 is an apocalyptic number.

74287139 is a deficient number, since it is larger than the sum of its proper divisors (1).

74287139 is an equidigital number, since it uses as much as digits as its factorization.

74287139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 74287139 is about 8618.9987237498. The cubic root of 74287139 is about 420.3759653174.

The spelling of 74287139 in words is "seventy-four million, two hundred eighty-seven thousand, one hundred thirty-nine".