816390787 has 2 divisors, whose sum is σ = 816390788. Its totient is φ = 816390786.

The previous prime is 816390767. The next prime is 816390833. The reversal of 816390787 is 787093618.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816390787 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 816390787.

It is not a weakly prime, because it can be changed into another prime (816390767) 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, 408195393 + 408195394.

It is an arithmetic number, because the mean of its divisors is an integer number (408195394).

Almost surely, 2^816390787 is an apocalyptic number.

816390787 is a deficient number, since it is larger than the sum of its proper divisors (1).

816390787 is an equidigital number, since it uses as much as digits as its factorization.

816390787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 816390787 is about 28572.5530360869. The cubic root of 816390787 is about 934.6148955018.

The spelling of 816390787 in words is "eight hundred sixteen million, three hundred ninety thousand, seven hundred eighty-seven".