84444991 has 8 divisors (see below), whose sum is σ = 87701504. Its totient is φ = 81247320.

The previous prime is 84444977. The next prime is 84445033. The reversal of 84444991 is 19944448.

It is a happy number.

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 84444991 - 2¹⁹ = 83920703 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84444931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11775 + ... + 17536.

It is an arithmetic number, because the mean of its divisors is an integer number (10962688).

Almost surely, 2^84444991 is an apocalyptic number.

84444991 is the 5306-th hex number.

84444991 is a deficient number, since it is larger than the sum of its proper divisors (3256513).

84444991 is a wasteful number, since it uses less digits than its factorization.

84444991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29421.

The product of its digits is 165888, while the sum is 43.

The square root of 84444991 is about 9189.3955731593. The cubic root of 84444991 is about 438.7239042063.

The spelling of 84444991 in words is "eighty-four million, four hundred forty-four thousand, nine hundred ninety-one".