84405490 has 16 divisors (see below), whose sum is σ = 163617048. Its totient is φ = 31165056.

The previous prime is 84405487. The next prime is 84405499. The reversal of 84405490 is 9450448.

It can be written as a sum of positive squares in 4 ways, for example, as 23049601 + 61355889 = 4801^2 + 7833^2 .

It is not an unprimeable number, because it can be changed into a prime (84405499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324507 + ... + 324766.

Almost surely, 2^84405490 is an apocalyptic number.

84405490 is a deficient number, since it is larger than the sum of its proper divisors (79211558).

84405490 is a wasteful number, since it uses less digits than its factorization.

84405490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649293.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 84405490 is about 9187.2460509121. The cubic root of 84405490 is about 438.6554859551.

The spelling of 84405490 in words is "eighty-four million, four hundred five thousand, four hundred ninety".