389777 has 4 divisors (see below), whose sum is σ = 391140. Its totient is φ = 388416.

The previous prime is 389773. The next prime is 389783. The reversal of 389777 is 777983.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 271441 + 118336 = 521^2 + 344^2 .

It is a cyclic number.

It is not a de Polignac number, because 389777 - 2² = 389773 is a prime.

It is a super-2 number, since 2×389777² = 303852219458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389773) 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, 68 + ... + 885.

It is an arithmetic number, because the mean of its divisors is an integer number (97785).

2³⁸⁹⁷⁷⁷ is an apocalyptic number.

It is an amenable number.

389777 is a deficient number, since it is larger than the sum of its proper divisors (1363).

389777 is an equidigital number, since it uses as much as digits as its factorization.

389777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362.

The product of its digits is 74088, while the sum is 41.

The square root of 389777 is about 624.3212314186. The cubic root of 389777 is about 73.0475077009.

It can be divided in two parts, 389 and 777, that multiplied together give a triangular number (302253 = T₇₇₇).

The spelling of 389777 in words is "three hundred eighty-nine thousand, seven hundred seventy-seven".