1821922373 has 2 divisors, whose sum is σ = 1821922374. Its totient is φ = 1821922372.

The previous prime is 1821922363. The next prime is 1821922379. The reversal of 1821922373 is 3732291281.

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., 1800559489 + 21362884 = 42433^2 + 4622^2 .

It is a cyclic number.

It is not a de Polignac number, because 1821922373 - 2¹⁰ = 1821921349 is a prime.

It is a super-3 number, since 3×1821922373³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1821922379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910961186 + 910961187.

It is an arithmetic number, because the mean of its divisors is an integer number (910961187).

Almost surely, 2^1821922373 is an apocalyptic number.

It is an amenable number.

1821922373 is a deficient number, since it is larger than the sum of its proper divisors (1).

1821922373 is an equidigital number, since it uses as much as digits as its factorization.

1821922373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 1821922373 is about 42683.9826281475. The cubic root of 1821922373 is about 1221.3588668438.

The spelling of 1821922373 in words is "one billion, eight hundred twenty-one million, nine hundred twenty-two thousand, three hundred seventy-three".