389999208877 has 2 divisors, whose sum is σ = 389999208878. Its totient is φ = 389999208876.

The previous prime is 389999208817. The next prime is 389999208881. The reversal of 389999208877 is 778802999983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379491728841 + 10507480036 = 616029^2 + 102506^2 .

It is a cyclic number.

It is not a de Polignac number, because 389999208877 - 2²⁷ = 389864991149 is a prime.

It is a super-2 number, since 2×389999208877² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 389999208797 and 389999208806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389999208817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194999604438 + 194999604439.

It is an arithmetic number, because the mean of its divisors is an integer number (194999604439).

Almost surely, 2^389999208877 is an apocalyptic number.

It is an amenable number.

389999208877 is a deficient number, since it is larger than the sum of its proper divisors (1).

389999208877 is an equidigital number, since it uses as much as digits as its factorization.

389999208877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 987614208, while the sum is 79.

The spelling of 389999208877 in words is "three hundred eighty-nine billion, nine hundred ninety-nine million, two hundred eight thousand, eight hundred seventy-seven".