287442139 has 2 divisors, whose sum is σ = 287442140. Its totient is φ = 287442138.

The previous prime is 287442101. The next prime is 287442157. The reversal of 287442139 is 931244782.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-287442139 is a prime.

It is not a weakly prime, because it can be changed into another prime (287542139) 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, 143721069 + 143721070.

It is an arithmetic number, because the mean of its divisors is an integer number (143721070).

Almost surely, 2^287442139 is an apocalyptic number.

287442139 is a deficient number, since it is larger than the sum of its proper divisors (1).

287442139 is an equidigital number, since it uses as much as digits as its factorization.

287442139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The square root of 287442139 is about 16954.1186441525. The cubic root of 287442139 is about 659.9587814785.

The spelling of 287442139 in words is "two hundred eighty-seven million, four hundred forty-two thousand, one hundred thirty-nine".