1818920923 has 2 divisors, whose sum is σ = 1818920924. Its totient is φ = 1818920922.

The previous prime is 1818920921. The next prime is 1818920951. The reversal of 1818920923 is 3290298181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1818920923 - 2¹ = 1818920921 is a prime.

Together with 1818920921, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1818920923.

It is not a weakly prime, because it can be changed into another prime (1818920921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909460461 + 909460462.

It is an arithmetic number, because the mean of its divisors is an integer number (909460462).

Almost surely, 2^1818920923 is an apocalyptic number.

1818920923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818920923 is an equidigital number, since it uses as much as digits as its factorization.

1818920923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 1818920923 is about 42648.8091627422. The cubic root of 1818920923 is about 1220.6878059690.

The spelling of 1818920923 in words is "one billion, eight hundred eighteen million, nine hundred twenty thousand, nine hundred twenty-three".