84978434 has 4 divisors (see below), whose sum is σ = 127467654. Its totient is φ = 42489216.

The previous prime is 84978433. The next prime is 84978457. The reversal of 84978434 is 43487948.

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

It can be written as a sum of positive squares in only one way, i.e., 78234025 + 6744409 = 8845^2 + 2597^2 .

It is not an unprimeable number, because it can be changed into a prime (84978433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21244607 + ... + 21244610.

Almost surely, 2^84978434 is an apocalyptic number.

84978434 is a deficient number, since it is larger than the sum of its proper divisors (42489220).

84978434 is a wasteful number, since it uses less digits than its factorization.

84978434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42489219.

The product of its digits is 774144, while the sum is 47.

The square root of 84978434 is about 9218.3748025343. The cubic root of 84978434 is about 439.6457789612.

The spelling of 84978434 in words is "eighty-four million, nine hundred seventy-eight thousand, four hundred thirty-four".