84491998 has 4 divisors (see below), whose sum is σ = 126738000. Its totient is φ = 42245998.

The previous prime is 84491977. The next prime is 84491999. The reversal of 84491998 is 89919448.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84491999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21122998 + ... + 21123001.

It is an arithmetic number, because the mean of its divisors is an integer number (31684500).

Almost surely, 2^84491998 is an apocalyptic number.

84491998 is a deficient number, since it is larger than the sum of its proper divisors (42246002).

84491998 is a wasteful number, since it uses less digits than its factorization.

84491998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42246001.

The product of its digits is 746496, while the sum is 52.

The square root of 84491998 is about 9191.9528937000. The cubic root of 84491998 is about 438.8052955311.

The spelling of 84491998 in words is "eighty-four million, four hundred ninety-one thousand, nine hundred ninety-eight".