91398873 has 8 divisors (see below), whose sum is σ = 128279200. Its totient is φ = 57725568.

The previous prime is 91398869. The next prime is 91398877. The reversal of 91398873 is 37889319.

It is an interprime number because it is at equal distance from previous prime (91398869) and next prime (91398877).

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

It is not a de Polignac number, because 91398873 - 2² = 91398869 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91398877) 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, 801688 + ... + 801801.

It is an arithmetic number, because the mean of its divisors is an integer number (16034900).

Almost surely, 2^91398873 is an apocalyptic number.

It is an amenable number.

91398873 is a deficient number, since it is larger than the sum of its proper divisors (36880327).

91398873 is a wasteful number, since it uses less digits than its factorization.

91398873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603511.

The product of its digits is 326592, while the sum is 48.

The square root of 91398873 is about 9560.2757805411. The cubic root of 91398873 is about 450.4503688647.

The spelling of 91398873 in words is "ninety-one million, three hundred ninety-eight thousand, eight hundred seventy-three".