1986804923 has 2 divisors, whose sum is σ = 1986804924. Its totient is φ = 1986804922.

The previous prime is 1986804917. The next prime is 1986804931. The reversal of 1986804923 is 3294086891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1986804923 is a prime.

It is not a weakly prime, because it can be changed into another prime (1986804983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993402461 + 993402462.

It is an arithmetic number, because the mean of its divisors is an integer number (993402462).

Almost surely, 2^1986804923 is an apocalyptic number.

1986804923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1986804923 is an equidigital number, since it uses as much as digits as its factorization.

1986804923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 1986804923 is about 44573.5899720900. The cubic root of 1986804923 is about 1257.1441414471.

The spelling of 1986804923 in words is "one billion, nine hundred eighty-six million, eight hundred four thousand, nine hundred twenty-three".