1365820 has 24 divisors (see below), whose sum is σ = 2931264. Its totient is φ = 534336.

The previous prime is 1365811. The next prime is 1365821. The reversal of 1365820 is 285631.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1365821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214 + ... + 1666.

It is an arithmetic number, because the mean of its divisors is an integer number (122136).

2^1365820 is an apocalyptic number.

1365820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1365820 is an abundant number, since it is smaller than the sum of its proper divisors (1565444).

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

1365820 is a wasteful number, since it uses less digits than its factorization.

1365820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509 (or 1507 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1365820 is about 1168.6830194711. The cubic root of 1365820 is about 110.9509834170.

The spelling of 1365820 in words is "one million, three hundred sixty-five thousand, eight hundred twenty".