91998340 has 24 divisors (see below), whose sum is σ = 220796352. Its totient is φ = 31542240.

The previous prime is 91998337. The next prime is 91998343. The reversal of 91998340 is 4389919.

It is an interprime number because it is at equal distance from previous prime (91998337) and next prime (91998343).

It is not an unprimeable number, because it can be changed into a prime (91998343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328426 + ... + 328705.

It is an arithmetic number, because the mean of its divisors is an integer number (9199848).

Almost surely, 2^91998340 is an apocalyptic number.

It is an amenable number.

91998340 is an abundant number, since it is smaller than the sum of its proper divisors (128798012).

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

91998340 is a wasteful number, since it uses less digits than its factorization.

91998340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657147 (or 657145 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 91998340 is about 9591.5765127533. The cubic root of 91998340 is about 451.4330283741.

The spelling of 91998340 in words is "ninety-one million, nine hundred ninety-eight thousand, three hundred forty".