1990902845 has 32 divisors (see below), whose sum is σ = 2516507136. Its totient is φ = 1510272000.

The previous prime is 1990902829. The next prime is 1990902847. The reversal of 1990902845 is 5482090991.

It is not a de Polignac number, because 1990902845 - 2⁴ = 1990902829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1990902845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990902847) 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 31 ways as a sum of consecutive naturals, for example, 3486410 + ... + 3486980.

It is an arithmetic number, because the mean of its divisors is an integer number (78640848).

Almost surely, 2^1990902845 is an apocalyptic number.

It is an amenable number.

1990902845 is a deficient number, since it is larger than the sum of its proper divisors (525604291).

1990902845 is a wasteful number, since it uses less digits than its factorization.

1990902845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061.

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 1990902845 is about 44619.5343431551. The cubic root of 1990902845 is about 1258.0078633506.

The spelling of 1990902845 in words is "one billion, nine hundred ninety million, nine hundred two thousand, eight hundred forty-five".