947856897 has 20 divisors (see below), whose sum is σ = 1524854100. Its totient is φ = 583295904.

The previous prime is 947856883. The next prime is 947856907. The reversal of 947856897 is 798658749.

It can be written as a sum of positive squares in 2 ways, for example, as 89132481 + 858724416 = 9441^2 + 29304^2 .

It is not a de Polignac number, because 947856897 - 2⁴ = 947856881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (947856827) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 449022 + ... + 451127.

It is an arithmetic number, because the mean of its divisors is an integer number (76242705).

Almost surely, 2^947856897 is an apocalyptic number.

It is an amenable number.

947856897 is a deficient number, since it is larger than the sum of its proper divisors (576997203).

947856897 is a wasteful number, since it uses less digits than its factorization.

947856897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900174 (or 900165 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The square root of 947856897 is about 30787.2846642896. The cubic root of 947856897 is about 982.3077976104.

It can be divided in two parts, 947856 and 897, that added together give a triangular number (948753 = T₁₃₇₇).

The spelling of 947856897 in words is "nine hundred forty-seven million, eight hundred fifty-six thousand, eight hundred ninety-seven".