98400991 has 8 divisors (see below), whose sum is σ = 107708384. Its totient is φ = 89341920.

The previous prime is 98400979. The next prime is 98401013. The reversal of 98400991 is 19900489.

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

It is a cyclic number.

It is not a de Polignac number, because 98400991 - 2¹³ = 98392799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98400191) 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, 61251 + ... + 62836.

It is an arithmetic number, because the mean of its divisors is an integer number (13463548).

Almost surely, 2^98400991 is an apocalyptic number.

98400991 is a deficient number, since it is larger than the sum of its proper divisors (9307393).

98400991 is a wasteful number, since it uses less digits than its factorization.

98400991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124161.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 98400991 is about 9919.7273652052. The cubic root of 98400991 is about 461.6715977931.

The spelling of 98400991 in words is "ninety-eight million, four hundred thousand, nine hundred ninety-one".