287228399 has 2 divisors, whose sum is σ = 287228400. Its totient is φ = 287228398.

The previous prime is 287228387. The next prime is 287228401. The reversal of 287228399 is 993822782.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-287228399 is a prime.

Together with 287228401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287228369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143614199 + 143614200.

It is an arithmetic number, because the mean of its divisors is an integer number (143614200).

Almost surely, 2^287228399 is an apocalyptic number.

287228399 is a deficient number, since it is larger than the sum of its proper divisors (1).

287228399 is an equidigital number, since it uses as much as digits as its factorization.

287228399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 50.

The square root of 287228399 is about 16947.8139888305. The cubic root of 287228399 is about 659.7951606439.

The spelling of 287228399 in words is "two hundred eighty-seven million, two hundred twenty-eight thousand, three hundred ninety-nine".