91938018 has 8 divisors (see below), whose sum is σ = 183876048. Its totient is φ = 30646004.

The previous prime is 91937983. The next prime is 91938019. The reversal of 91938018 is 81083919.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

91938018 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (91938019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7661496 + ... + 7661507.

It is an arithmetic number, because the mean of its divisors is an integer number (22984506).

Almost surely, 2^91938018 is an apocalyptic number.

91938018 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91938018 is a wasteful number, since it uses less digits than its factorization.

91938018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15323008.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 91938018 is about 9588.4314671379. The cubic root of 91938018 is about 451.3343407345.

The spelling of 91938018 in words is "ninety-one million, nine hundred thirty-eight thousand, eighteen".