84478739 has 4 divisors (see below), whose sum is σ = 85636056. Its totient is φ = 83321424.

The previous prime is 84478699. The next prime is 84478777. The reversal of 84478739 is 93787448.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84478739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84478799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578549 + ... + 578694.

It is an arithmetic number, because the mean of its divisors is an integer number (21409014).

Almost surely, 2^84478739 is an apocalyptic number.

84478739 is a deficient number, since it is larger than the sum of its proper divisors (1157317).

84478739 is a wasteful number, since it uses less digits than its factorization.

84478739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157316.

The product of its digits is 1354752, while the sum is 50.

The square root of 84478739 is about 9191.2316367286. The cubic root of 84478739 is about 438.7823409953.

The spelling of 84478739 in words is "eighty-four million, four hundred seventy-eight thousand, seven hundred thirty-nine".