1821130 has 16 divisors (see below), whose sum is σ = 3295080. Its totient is φ = 724672.

The previous prime is 1821121. The next prime is 1821137. The reversal of 1821130 is 311281.

It can be written as a sum of positive squares in 4 ways, for example, as 1580049 + 241081 = 1257^2 + 491^2 .

It is not an unprimeable number, because it can be changed into a prime (1821137) 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, 2352 + ... + 3028.

2^1821130 is an apocalyptic number.

1821130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1821130 is a deficient number, since it is larger than the sum of its proper divisors (1473950).

1821130 is a wasteful number, since it uses less digits than its factorization.

1821130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1821130 is about 1349.4924972003. The cubic root of 1821130 is about 122.1181780609.

The spelling of 1821130 in words is "one million, eight hundred twenty-one thousand, one hundred thirty".