91383390 has 160 divisors (see below), whose sum is σ = 286032384. Its totient is φ = 20502720.

The previous prime is 91383361. The next prime is 91383421. The reversal of 91383390 is 9338319.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 402457 + ... + 402683.

Almost surely, 2^91383390 is an apocalyptic number.

91383390 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 91383390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143016192).

91383390 is an abundant number, since it is smaller than the sum of its proper divisors (194648994).

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

91383390 is a wasteful number, since it uses less digits than its factorization.

91383390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 91383390 is about 9559.4659892695. The cubic root of 91383390 is about 450.4249319467.

The spelling of 91383390 in words is "ninety-one million, three hundred eighty-three thousand, three hundred ninety".