84390087 has 16 divisors (see below), whose sum is σ = 117072000. Its totient is φ = 54006624.

The previous prime is 84390079. The next prime is 84390101. The reversal of 84390087 is 78009348.

It is not a de Polignac number, because 84390087 - 2³ = 84390079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84394087) 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 15 ways as a sum of consecutive naturals, for example, 12864 + ... + 18282.

It is an arithmetic number, because the mean of its divisors is an integer number (7317000).

Almost surely, 2^84390087 is an apocalyptic number.

84390087 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

84390087 is a deficient number, since it is larger than the sum of its proper divisors (32681913).

84390087 is a wasteful number, since it uses less digits than its factorization.

84390087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5630.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 84390087 is about 9186.4077309904. The cubic root of 84390087 is about 438.6288011921.

The spelling of 84390087 in words is "eighty-four million, three hundred ninety thousand, eighty-seven".