84138877 has 2 divisors, whose sum is σ = 84138878. Its totient is φ = 84138876.

The previous prime is 84138869. The next prime is 84138881. The reversal of 84138877 is 77883148.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80532676 + 3606201 = 8974^2 + 1899^2 .

It is a cyclic number.

It is not a de Polignac number, because 84138877 - 2³ = 84138869 is a prime.

It is a super-2 number, since 2×84138877² = 14158701245642258, which contains 22 as substring.

It is equal to p_4896676 and since 84138877 and 4896676 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84138827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42069438 + 42069439.

It is an arithmetic number, because the mean of its divisors is an integer number (42069439).

Almost surely, 2^84138877 is an apocalyptic number.

It is an amenable number.

84138877 is a deficient number, since it is larger than the sum of its proper divisors (1).

84138877 is an equidigital number, since it uses as much as digits as its factorization.

84138877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 301056, while the sum is 46.

The square root of 84138877 is about 9172.7246224881. The cubic root of 84138877 is about 438.1931360525.

The spelling of 84138877 in words is "eighty-four million, one hundred thirty-eight thousand, eight hundred seventy-seven".