97856918 has 4 divisors (see below), whose sum is σ = 146785380. Its totient is φ = 48928458.

The previous prime is 97856911. The next prime is 97856939. The reversal of 97856918 is 81965879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81965879 = 71 ⋅1154449.

It is a self number, because there is not a number n which added to its sum of digits gives 97856918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97856911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24464228 + ... + 24464231.

It is an arithmetic number, because the mean of its divisors is an integer number (36696345).

Almost surely, 2^97856918 is an apocalyptic number.

97856918 is a deficient number, since it is larger than the sum of its proper divisors (48928462).

97856918 is a wasteful number, since it uses less digits than its factorization.

97856918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48928461.

The product of its digits is 1088640, while the sum is 53.

The square root of 97856918 is about 9892.2655645711. The cubic root of 97856918 is about 460.8191422159.

The spelling of 97856918 in words is "ninety-seven million, eight hundred fifty-six thousand, nine hundred eighteen".