1827689421 has 4 divisors (see below), whose sum is σ = 2436919232. Its totient is φ = 1218459612.

The previous prime is 1827689419. The next prime is 1827689441. The reversal of 1827689421 is 1249867281.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1827689421 - 2¹ = 1827689419 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 (1827689441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304614901 + ... + 304614906.

It is an arithmetic number, because the mean of its divisors is an integer number (609229808).

Almost surely, 2^1827689421 is an apocalyptic number.

It is an amenable number.

1827689421 is a deficient number, since it is larger than the sum of its proper divisors (609229811).

1827689421 is an equidigital number, since it uses as much as digits as its factorization.

1827689421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609229810.

The product of its digits is 387072, while the sum is 48.

The square root of 1827689421 is about 42751.4844303680. The cubic root of 1827689421 is about 1222.6461914239.

The spelling of 1827689421 in words is "one billion, eight hundred twenty-seven million, six hundred eighty-nine thousand, four hundred twenty-one".