287806397 has 2 divisors, whose sum is σ = 287806398. Its totient is φ = 287806396.

The previous prime is 287806361. The next prime is 287806487. The reversal of 287806397 is 793608782.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 266701561 + 21104836 = 16331^2 + 4594^2 .

It is a cyclic number.

It is not a de Polignac number, because 287806397 - 2¹⁸ = 287544253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287406397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143903198 + 143903199.

It is an arithmetic number, because the mean of its divisors is an integer number (143903199).

Almost surely, 2^287806397 is an apocalyptic number.

It is an amenable number.

287806397 is a deficient number, since it is larger than the sum of its proper divisors (1).

287806397 is an equidigital number, since it uses as much as digits as its factorization.

287806397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The square root of 287806397 is about 16964.8577064472. The cubic root of 287806397 is about 660.2374390569.

The spelling of 287806397 in words is "two hundred eighty-seven million, eight hundred six thousand, three hundred ninety-seven".