99478189 has 4 divisors (see below), whose sum is σ = 101164320. Its totient is φ = 97792060.

The previous prime is 99478153. The next prime is 99478193. The reversal of 99478189 is 98187499.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99478189 - 2⁷ = 99478061 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 (99478199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 842977 + ... + 843094.

It is an arithmetic number, because the mean of its divisors is an integer number (25291080).

Almost surely, 2^99478189 is an apocalyptic number.

It is an amenable number.

99478189 is a deficient number, since it is larger than the sum of its proper divisors (1686131).

99478189 is a wasteful number, since it uses less digits than its factorization.

99478189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686130.

The product of its digits is 1306368, while the sum is 55.

The square root of 99478189 is about 9973.8753250680. The cubic root of 99478189 is about 463.3501309692.

The spelling of 99478189 in words is "ninety-nine million, four hundred seventy-eight thousand, one hundred eighty-nine".