386840 has 32 divisors (see below), whose sum is σ = 918000. Its totient is φ = 146304.

The previous prime is 386839. The next prime is 386851. The reversal of 386840 is 48683.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506 + ... + 1014.

2³⁸⁶⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 386840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (459000).

386840 is an abundant number, since it is smaller than the sum of its proper divisors (531160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

386840 is a wasteful number, since it uses less digits than its factorization.

386840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539 (or 535 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 386840 is about 621.9646292194. The cubic root of 386840 is about 72.8635720512.

The spelling of 386840 in words is "three hundred eighty-six thousand, eight hundred forty".