856402619 has 2 divisors, whose sum is σ = 856402620. Its totient is φ = 856402618.

The previous prime is 856402579. The next prime is 856402627. The reversal of 856402619 is 916204658.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856402619 is a prime.

It is a super-2 number, since 2×856402619² = 1466850891660118322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (856405619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428201309 + 428201310.

It is an arithmetic number, because the mean of its divisors is an integer number (428201310).

Almost surely, 2^856402619 is an apocalyptic number.

856402619 is a deficient number, since it is larger than the sum of its proper divisors (1).

856402619 is an equidigital number, since it uses as much as digits as its factorization.

856402619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 856402619 is about 29264.3574848313. The cubic root of 856402619 is about 949.6407206514.

The spelling of 856402619 in words is "eight hundred fifty-six million, four hundred two thousand, six hundred nineteen".