856979155 has 8 divisors (see below), whose sum is σ = 1029302352. Its totient is φ = 684965088.

The previous prime is 856979119. The next prime is 856979161. The reversal of 856979155 is 551979658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856979155 - 2¹³ = 856970963 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 856979096 and 856979105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71137 + ... + 82306.

It is an arithmetic number, because the mean of its divisors is an integer number (128662794).

Almost surely, 2^856979155 is an apocalyptic number.

856979155 is a deficient number, since it is larger than the sum of its proper divisors (172323197).

856979155 is a wasteful number, since it uses less digits than its factorization.

856979155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154565.

The product of its digits is 3402000, while the sum is 55.

The square root of 856979155 is about 29274.2063086260. The cubic root of 856979155 is about 949.8537743544.

The spelling of 856979155 in words is "eight hundred fifty-six million, nine hundred seventy-nine thousand, one hundred fifty-five".