91983394 has 16 divisors (see below), whose sum is σ = 144247680. Its totient is φ = 43908480.

The previous prime is 91983391. The next prime is 91983401. The reversal of 91983394 is 49338919.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is not an unprimeable number, because it can be changed into a prime (91983391) 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, 27442 + ... + 30610.

It is an arithmetic number, because the mean of its divisors is an integer number (9015480).

Almost surely, 2^91983394 is an apocalyptic number.

91983394 is a deficient number, since it is larger than the sum of its proper divisors (52264286).

91983394 is a wasteful number, since it uses less digits than its factorization.

91983394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3825.

The product of its digits is 209952, while the sum is 46.

The square root of 91983394 is about 9590.7973599696. The cubic root of 91983394 is about 451.4085805291.

The spelling of 91983394 in words is "ninety-one million, nine hundred eighty-three thousand, three hundred ninety-four".