947897818 has 16 divisors (see below), whose sum is σ = 1629658944. Its totient is φ = 405069120.

The previous prime is 947897809. The next prime is 947897887. The reversal of 947897818 is 818798749.

It is a happy number.

It is a super-2 number, since 2×947897818² = 1797020546738322248, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92703 + ... + 102418.

It is an arithmetic number, because the mean of its divisors is an integer number (101853684).

Almost surely, 2^947897818 is an apocalyptic number.

947897818 is a deficient number, since it is larger than the sum of its proper divisors (681761126).

947897818 is a wasteful number, since it uses less digits than its factorization.

947897818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195477.

The product of its digits is 8128512, while the sum is 61.

The square root of 947897818 is about 30787.9492334257. The cubic root of 947897818 is about 982.3219335133.

The spelling of 947897818 in words is "nine hundred forty-seven million, eight hundred ninety-seven thousand, eight hundred eighteen".