84378493 has 2 divisors, whose sum is σ = 84378494. Its totient is φ = 84378492.

The previous prime is 84378473. The next prime is 84378521. The reversal of 84378493 is 39487348.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82410084 + 1968409 = 9078^2 + 1403^2 .

It is a cyclic number.

It is not a de Polignac number, because 84378493 - 2⁵ = 84378461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84378403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42189246 + 42189247.

It is an arithmetic number, because the mean of its divisors is an integer number (42189247).

Almost surely, 2^84378493 is an apocalyptic number.

It is an amenable number.

84378493 is a deficient number, since it is larger than the sum of its proper divisors (1).

84378493 is an equidigital number, since it uses as much as digits as its factorization.

84378493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 46.

The square root of 84378493 is about 9185.7766683063. The cubic root of 84378493 is about 438.6087131485.

The spelling of 84378493 in words is "eighty-four million, three hundred seventy-eight thousand, four hundred ninety-three".