287738939 has 2 divisors, whose sum is σ = 287738940. Its totient is φ = 287738938.

The previous prime is 287738921. The next prime is 287738951. The reversal of 287738939 is 939837782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 287738939 - 2¹⁶ = 287673403 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (287738909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143869469 + 143869470.

It is an arithmetic number, because the mean of its divisors is an integer number (143869470).

Almost surely, 2^287738939 is an apocalyptic number.

287738939 is a deficient number, since it is larger than the sum of its proper divisors (1).

287738939 is an equidigital number, since it uses as much as digits as its factorization.

287738939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4572288, while the sum is 56.

The square root of 287738939 is about 16962.8694211799. The cubic root of 287738939 is about 660.1858513949.

The spelling of 287738939 in words is "two hundred eighty-seven million, seven hundred thirty-eight thousand, nine hundred thirty-nine".