84420491 has 4 divisors (see below), whose sum is σ = 85609584. Its totient is φ = 83231400.

The previous prime is 84420473. The next prime is 84420509. The reversal of 84420491 is 19402448.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (84420473) and next prime (84420509).

It is a cyclic number.

It is not a de Polignac number, because 84420491 - 2²² = 80226187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84420431) 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 3 ways as a sum of consecutive naturals, for example, 594440 + ... + 594581.

It is an arithmetic number, because the mean of its divisors is an integer number (21402396).

Almost surely, 2^84420491 is an apocalyptic number.

84420491 is a deficient number, since it is larger than the sum of its proper divisors (1189093).

84420491 is a wasteful number, since it uses less digits than its factorization.

84420491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189092.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 84420491 is about 9188.0624181598. The cubic root of 84420491 is about 438.6814711572.

The spelling of 84420491 in words is "eighty-four million, four hundred twenty thousand, four hundred ninety-one".