1990211023 has 4 divisors (see below), whose sum is σ = 2000631168. Its totient is φ = 1979790880.

The previous prime is 1990210987. The next prime is 1990211039. The reversal of 1990211023 is 3201120991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1990211023 - 2¹³ = 1990202831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1990210982 and 1990211000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990211123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5209786 + ... + 5210167.

It is an arithmetic number, because the mean of its divisors is an integer number (500157792).

Almost surely, 2^1990211023 is an apocalyptic number.

1990211023 is a deficient number, since it is larger than the sum of its proper divisors (10420145).

1990211023 is a wasteful number, since it uses less digits than its factorization.

1990211023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10420144.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 1990211023 is about 44611.7812130383. The cubic root of 1990211023 is about 1257.8621307504.

The spelling of 1990211023 in words is "one billion, nine hundred ninety million, two hundred eleven thousand, twenty-three".