1137821 has 4 divisors (see below), whose sum is σ = 1144572. Its totient is φ = 1131072.

The previous prime is 1137817. The next prime is 1137859. The reversal of 1137821 is 1287311.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1287311 = 211 ⋅6101.

It can be written as a sum of positive squares in 2 ways, for example, as 1092025 + 45796 = 1045^2 + 214^2 .

It is a cyclic number.

It is not a de Polignac number, because 1137821 - 2² = 1137817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1137811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3116 + ... + 3461.

It is an arithmetic number, because the mean of its divisors is an integer number (286143).

2^1137821 is an apocalyptic number.

It is an amenable number.

1137821 is a deficient number, since it is larger than the sum of its proper divisors (6751).

1137821 is an equidigital number, since it uses as much as digits as its factorization.

1137821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6750.

The product of its digits is 336, while the sum is 23.

The square root of 1137821 is about 1066.6869268909. The cubic root of 1137821 is about 104.3977923619.

The spelling of 1137821 in words is "one million, one hundred thirty-seven thousand, eight hundred twenty-one".