1820943401 has 2 divisors, whose sum is σ = 1820943402. Its totient is φ = 1820943400.

The previous prime is 1820943367. The next prime is 1820943469. The reversal of 1820943401 is 1043490281.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1080831376 + 740112025 = 32876^2 + 27205^2 .

It is a cyclic number.

It is not a de Polignac number, because 1820943401 - 2¹⁰ = 1820942377 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1820943001) 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, 910471700 + 910471701.

It is an arithmetic number, because the mean of its divisors is an integer number (910471701).

Almost surely, 2^1820943401 is an apocalyptic number.

It is an amenable number.

1820943401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820943401 is an equidigital number, since it uses as much as digits as its factorization.

1820943401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1820943401 is about 42672.5134132031. The cubic root of 1820943401 is about 1221.1400704100.

The spelling of 1820943401 in words is "one billion, eight hundred twenty million, nine hundred forty-three thousand, four hundred one".