84978123 has 16 divisors (see below), whose sum is σ = 118748160. Its totient is φ = 53951744.

The previous prime is 84978109. The next prime is 84978137. The reversal of 84978123 is 32187948.

It is an interprime number because it is at equal distance from previous prime (84978109) and next prime (84978137).

It is not a de Polignac number, because 84978123 - 2⁴ = 84978107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84978163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13915 + ... + 19067.

It is an arithmetic number, because the mean of its divisors is an integer number (7421760).

Almost surely, 2^84978123 is an apocalyptic number.

84978123 is a deficient number, since it is larger than the sum of its proper divisors (33770037).

84978123 is a wasteful number, since it uses less digits than its factorization.

84978123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5418.

The product of its digits is 96768, while the sum is 42.

The square root of 84978123 is about 9218.3579340358. The cubic root of 84978123 is about 439.6452426291.

The spelling of 84978123 in words is "eighty-four million, nine hundred seventy-eight thousand, one hundred twenty-three".