84387789 has 12 divisors (see below), whose sum is σ = 122713500. Its totient is φ = 55880064.

The previous prime is 84387763. The next prime is 84387841. The reversal of 84387789 is 98778348.

It can be written as a sum of positive squares in 2 ways, for example, as 32114889 + 52272900 = 5667^2 + 7230^2 .

It is not a de Polignac number, because 84387789 - 2⁵ = 84387757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84380789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30124 + ... + 32805.

It is an arithmetic number, because the mean of its divisors is an integer number (10226125).

Almost surely, 2^84387789 is an apocalyptic number.

It is an amenable number.

84387789 is a deficient number, since it is larger than the sum of its proper divisors (38325711).

84387789 is a wasteful number, since it uses less digits than its factorization.

84387789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63084 (or 63081 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 84387789 is about 9186.2826540446. The cubic root of 84387789 is about 438.6248197682.

The spelling of 84387789 in words is "eighty-four million, three hundred eighty-seven thousand, seven hundred eighty-nine".