1139820 has 72 divisors (see below), whose sum is σ = 3530352. Its totient is φ = 274560.

The previous prime is 1139819. The next prime is 1139843. The reversal of 1139820 is 289311.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7182 + ... + 7338.

2^1139820 is an apocalyptic number.

1139820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1139820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1765176).

1139820 is an abundant number, since it is smaller than the sum of its proper divisors (2390532).

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

1139820 is a wasteful number, since it uses less digits than its factorization.

1139820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1139820 is about 1067.6235291525. The cubic root of 1139820 is about 104.4588942669.

The spelling of 1139820 in words is "one million, one hundred thirty-nine thousand, eight hundred twenty".