1820383493 has 2 divisors, whose sum is σ = 1820383494. Its totient is φ = 1820383492.

The previous prime is 1820383489. The next prime is 1820383531. The reversal of 1820383493 is 3943830281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1652991649 + 167391844 = 40657^2 + 12938^2 .

It is a cyclic number.

It is not a de Polignac number, because 1820383493 - 2² = 1820383489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1820383493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1820383423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910191746 + 910191747.

It is an arithmetic number, because the mean of its divisors is an integer number (910191747).

Almost surely, 2^1820383493 is an apocalyptic number.

It is an amenable number.

1820383493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820383493 is an equidigital number, since it uses as much as digits as its factorization.

1820383493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 1820383493 is about 42665.9523859482. The cubic root of 1820383493 is about 1221.0148978970.

The spelling of 1820383493 in words is "one billion, eight hundred twenty million, three hundred eighty-three thousand, four hundred ninety-three".