1990618093 has 8 divisors (see below), whose sum is σ = 2072427128. Its totient is φ = 1910283264.

The previous prime is 1990618081. The next prime is 1990618127. The reversal of 1990618093 is 3908160991.

It can be written as a sum of positive squares in 4 ways, for example, as 680322889 + 1310295204 = 26083^2 + 36198^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1990618093 - 2⁵ = 1990618061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990618793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365796 + ... + 371197.

It is an arithmetic number, because the mean of its divisors is an integer number (259053391).

Almost surely, 2^1990618093 is an apocalyptic number.

It is an amenable number.

1990618093 is a deficient number, since it is larger than the sum of its proper divisors (81809035).

1990618093 is an equidigital number, since it uses as much as digits as its factorization.

1990618093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737103.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 1990618093 is about 44616.3433396328. The cubic root of 1990618093 is about 1257.9478843088.

The spelling of 1990618093 in words is "one billion, nine hundred ninety million, six hundred eighteen thousand, ninety-three".