287694397 has 2 divisors, whose sum is σ = 287694398. Its totient is φ = 287694396.

The previous prime is 287694391. The next prime is 287694401. The reversal of 287694397 is 793496782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 267028281 + 20666116 = 16341^2 + 4546^2 .

It is a cyclic number.

It is not a de Polignac number, because 287694397 - 2²⁷ = 153476669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287694391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143847198 + 143847199.

It is an arithmetic number, because the mean of its divisors is an integer number (143847199).

Almost surely, 2^287694397 is an apocalyptic number.

It is an amenable number.

287694397 is a deficient number, since it is larger than the sum of its proper divisors (1).

287694397 is an equidigital number, since it uses as much as digits as its factorization.

287694397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 55.

The square root of 287694397 is about 16961.5564439116. The cubic root of 287694397 is about 660.1517840377.

The spelling of 287694397 in words is "two hundred eighty-seven million, six hundred ninety-four thousand, three hundred ninety-seven".