91686394 has 16 divisors (see below), whose sum is σ = 139806720. Its totient is φ = 45087840.

The previous prime is 91686391. The next prime is 91686421. The reversal of 91686394 is 49368619.

It is not an unprimeable number, because it can be changed into a prime (91686391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71047 + ... + 72325.

It is an arithmetic number, because the mean of its divisors is an integer number (8737920).

Almost surely, 2^91686394 is an apocalyptic number.

91686394 is a deficient number, since it is larger than the sum of its proper divisors (48120326).

91686394 is a wasteful number, since it uses less digits than its factorization.

91686394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845.

The product of its digits is 279936, while the sum is 46.

The square root of 91686394 is about 9575.3012485248. The cubic root of 91686394 is about 450.9222141057.

The spelling of 91686394 in words is "ninety-one million, six hundred eighty-six thousand, three hundred ninety-four".