1990726093 has 2 divisors, whose sum is σ = 1990726094. Its totient is φ = 1990726092.

The previous prime is 1990726019. The next prime is 1990726097. The reversal of 1990726093 is 3906270991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1676656809 + 314069284 = 40947^2 + 17722^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990726093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990726097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995363046 + 995363047.

It is an arithmetic number, because the mean of its divisors is an integer number (995363047).

Almost surely, 2^1990726093 is an apocalyptic number.

It is an amenable number.

1990726093 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990726093 is an equidigital number, since it uses as much as digits as its factorization.

1990726093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 183708, while the sum is 46.

The square root of 1990726093 is about 44617.5536420364. The cubic root of 1990726093 is about 1257.9706336775.

The spelling of 1990726093 in words is "one billion, nine hundred ninety million, seven hundred twenty-six thousand, ninety-three".