1896411821 has 4 divisors (see below), whose sum is σ = 1896502272. Its totient is φ = 1896321372.

The previous prime is 1896411809. The next prime is 1896411841. The reversal of 1896411821 is 1281146981.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1281146981 = 7411 ⋅172871.

It is a cyclic number.

It is not a de Polignac number, because 1896411821 - 2¹⁰ = 1896410797 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 (1896411841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4310 + ... + 61736.

It is an arithmetic number, because the mean of its divisors is an integer number (474125568).

Almost surely, 2^1896411821 is an apocalyptic number.

It is an amenable number.

1896411821 is a deficient number, since it is larger than the sum of its proper divisors (90451).

1896411821 is an equidigital number, since it uses as much as digits as its factorization.

1896411821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90450.

The product of its digits is 27648, while the sum is 41.

The square root of 1896411821 is about 43547.8107486473. The cubic root of 1896411821 is about 1237.7821570133.

The spelling of 1896411821 in words is "one billion, eight hundred ninety-six million, four hundred eleven thousand, eight hundred twenty-one".