947785385 has 4 divisors (see below), whose sum is σ = 1137342468. Its totient is φ = 758228304.

The previous prime is 947785369. The next prime is 947785469. The reversal of 947785385 is 583587749.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583587749 = 16127 ⋅36187.

It can be written as a sum of positive squares in 2 ways, for example, as 583319104 + 364466281 = 24152^2 + 19091^2 .

It is a cyclic number.

It is not a de Polignac number, because 947785385 - 2⁴ = 947785369 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 947785385.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94778534 + ... + 94778543.

It is an arithmetic number, because the mean of its divisors is an integer number (284335617).

Almost surely, 2^947785385 is an apocalyptic number.

It is an amenable number.

947785385 is a deficient number, since it is larger than the sum of its proper divisors (189557083).

947785385 is a wasteful number, since it uses less digits than its factorization.

947785385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189557082.

The product of its digits is 8467200, while the sum is 56.

The square root of 947785385 is about 30786.1232538298. The cubic root of 947785385 is about 982.2830932617.

The spelling of 947785385 in words is "nine hundred forty-seven million, seven hundred eighty-five thousand, three hundred eighty-five".