84389121 has 10 divisors (see below), whose sum is σ = 126062882. Its totient is φ = 56259360.

The previous prime is 84389117. The next prime is 84389131. The reversal of 84389121 is 12198348.

It can be written as a sum of positive squares in only one way, i.e., 68707521 + 15681600 = 8289^2 + 3960^2 .

It is not a de Polignac number, because 84389121 - 2² = 84389117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84389131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 520840 + ... + 521001.

Almost surely, 2^84389121 is an apocalyptic number.

84389121 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

84389121 is a deficient number, since it is larger than the sum of its proper divisors (41673761).

84389121 is a wasteful number, since it uses less digits than its factorization.

84389121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041853 (or 1041844 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 84389121 is about 9186.3551531606. The cubic root of 84389121 is about 438.6271275475.

The spelling of 84389121 in words is "eighty-four million, three hundred eighty-nine thousand, one hundred twenty-one".