1821479873 has 2 divisors, whose sum is σ = 1821479874. Its totient is φ = 1821479872.

The previous prime is 1821479839. The next prime is 1821479887. The reversal of 1821479873 is 3789741281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1659095824 + 162384049 = 40732^2 + 12743^2 .

It is a cyclic number.

It is not a de Polignac number, because 1821479873 - 2⁶ = 1821479809 is a prime.

It is a super-2 number, since 2×1821479873² = 6635577855488192258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1821479573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910739936 + 910739937.

It is an arithmetic number, because the mean of its divisors is an integer number (910739937).

Almost surely, 2^1821479873 is an apocalyptic number.

It is an amenable number.

1821479873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1821479873 is an equidigital number, since it uses as much as digits as its factorization.

1821479873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 50.

The square root of 1821479873 is about 42678.7988701650. The cubic root of 1821479873 is about 1221.2599795244.

The spelling of 1821479873 in words is "one billion, eight hundred twenty-one million, four hundred seventy-nine thousand, eight hundred seventy-three".