99197784 has 160 divisors (see below), whose sum is σ = 334540800. Its totient is φ = 26827200.

The previous prime is 99197783. The next prime is 99197797. The reversal of 99197784 is 48779199.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 99197784.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99197783) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 85609 + ... + 86759.

It is an arithmetic number, because the mean of its divisors is an integer number (2090880).

Almost surely, 2^99197784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99197784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167270400).

99197784 is an abundant number, since it is smaller than the sum of its proper divisors (235343016).

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

99197784 is a wasteful number, since it uses less digits than its factorization.

99197784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195 (or 1182 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 99197784 is about 9959.8084318927. The cubic root of 99197784 is about 462.9143638840.

The spelling of 99197784 in words is "ninety-nine million, one hundred ninety-seven thousand, seven hundred eighty-four".