856377629 has 4 divisors (see below), whose sum is σ = 856956576. Its totient is φ = 855798684.

The previous prime is 856377623. The next prime is 856377661. The reversal of 856377629 is 926773658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 926773658 = 2 ⋅463386829.

It is a cyclic number.

It is not a de Polignac number, because 856377629 - 2²⁰ = 855329053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856377623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287249 + ... + 290214.

It is an arithmetic number, because the mean of its divisors is an integer number (214239144).

Almost surely, 2^856377629 is an apocalyptic number.

It is an amenable number.

856377629 is a deficient number, since it is larger than the sum of its proper divisors (578947).

856377629 is a wasteful number, since it uses less digits than its factorization.

856377629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578946.

The product of its digits is 3810240, while the sum is 53.

The square root of 856377629 is about 29263.9305118092. The cubic root of 856377629 is about 949.6314836594.

The spelling of 856377629 in words is "eight hundred fifty-six million, three hundred seventy-seven thousand, six hundred twenty-nine".