1138820 has 12 divisors (see below), whose sum is σ = 2391564. Its totient is φ = 455520.

The previous prime is 1138793. The next prime is 1138829. The reversal of 1138820 is 288311.

It can be written as a sum of positive squares in 2 ways, for example, as 495616 + 643204 = 704^2 + 802^2 .

It is not an unprimeable number, because it can be changed into a prime (1138829) 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, 28451 + ... + 28490.

It is an arithmetic number, because the mean of its divisors is an integer number (199297).

2^1138820 is an apocalyptic number.

1138820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1138820 is an abundant number, since it is smaller than the sum of its proper divisors (1252744).

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

1138820 is a wasteful number, since it uses less digits than its factorization.

1138820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56950 (or 56948 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 1138820 is about 1067.1550965066. The cubic root of 1138820 is about 104.4283369691.

The spelling of 1138820 in words is "one million, one hundred thirty-eight thousand, eight hundred twenty".