1385820 has 36 divisors (see below), whose sum is σ = 4204200. Its totient is φ = 369504.

The previous prime is 1385809. The next prime is 1385827. The reversal of 1385820 is 285831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3670 + ... + 4029.

2^1385820 is an apocalyptic number.

1385820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1385820 is an abundant number, since it is smaller than the sum of its proper divisors (2818380).

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

1385820 is a wasteful number, since it uses less digits than its factorization.

1385820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7714 (or 7709 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1385820 is about 1177.2085626600. The cubic root of 1385820 is about 111.4899211331.

The spelling of 1385820 in words is "one million, three hundred eighty-five thousand, eight hundred twenty".