389278 has 8 divisors (see below), whose sum is σ = 588240. Its totient is φ = 193200.

The previous prime is 389273. The next prime is 389287. The reversal of 389278 is 872983.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×389278² = 303074722568, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343 + ... + 946.

It is an arithmetic number, because the mean of its divisors is an integer number (73530).

389278 is a Friedman number, since it can be written as 89*3^7*2-8, using all its digits and the basic arithmetic operations.

2³⁸⁹²⁷⁸ is an apocalyptic number.

389278 is the 334-th centered heptagonal number.

389278 is a deficient number, since it is larger than the sum of its proper divisors (198962).

389278 is a wasteful number, since it uses less digits than its factorization.

389278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1442.

The product of its digits is 24192, while the sum is 37.

The square root of 389278 is about 623.9214694174. The cubic root of 389278 is about 73.0163221149.

It can be divided in two parts, 38 and 9278, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 389278 in words is "three hundred eighty-nine thousand, two hundred seventy-eight".