1827237821 has 2 divisors, whose sum is σ = 1827237822. Its totient is φ = 1827237820.

The previous prime is 1827237817. The next prime is 1827237901. The reversal of 1827237821 is 1287327281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1791405625 + 35832196 = 42325^2 + 5986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1827237821 - 2² = 1827237817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1827237221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 913618910 + 913618911.

It is an arithmetic number, because the mean of its divisors is an integer number (913618911).

Almost surely, 2^1827237821 is an apocalyptic number.

It is an amenable number.

1827237821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1827237821 is an equidigital number, since it uses as much as digits as its factorization.

1827237821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 41.

The square root of 1827237821 is about 42746.2024161211. The cubic root of 1827237821 is about 1222.5454827557.

The spelling of 1827237821 in words is "one billion, eight hundred twenty-seven million, two hundred thirty-seven thousand, eight hundred twenty-one".