856940629 has 2 divisors, whose sum is σ = 856940630. Its totient is φ = 856940628.

The previous prime is 856940587. The next prime is 856940659. The reversal of 856940629 is 926049658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 846228100 + 10712529 = 29090^2 + 3273^2 .

It is a cyclic number.

It is not a de Polignac number, because 856940629 - 2¹⁵ = 856907861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856940659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428470314 + 428470315.

It is an arithmetic number, because the mean of its divisors is an integer number (428470315).

Almost surely, 2^856940629 is an apocalyptic number.

It is an amenable number.

856940629 is a deficient number, since it is larger than the sum of its proper divisors (1).

856940629 is an equidigital number, since it uses as much as digits as its factorization.

856940629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 856940629 is about 29273.5482816826. The cubic root of 856940629 is about 949.8395403968.

The spelling of 856940629 in words is "eight hundred fifty-six million, nine hundred forty thousand, six hundred twenty-nine".