1990329813 has 20 divisors (see below), whose sum is σ = 2982930720. Its totient is φ = 1322547912.

The previous prime is 1990329799. The next prime is 1990329823. The reversal of 1990329813 is 3189230991.

It is a happy number.

It is not a de Polignac number, because 1990329813 - 2¹⁰ = 1990328789 is a prime.

It is a super-2 number, since 2×1990329813² = 7922825529033229938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990329823) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15153 + ... + 64886.

It is an arithmetic number, because the mean of its divisors is an integer number (149146536).

Almost surely, 2^1990329813 is an apocalyptic number.

It is an amenable number.

1990329813 is a deficient number, since it is larger than the sum of its proper divisors (992600907).

1990329813 is an equidigital number, since it uses as much as digits as its factorization.

1990329813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80358 (or 80349 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 1990329813 is about 44613.1125679435. The cubic root of 1990329813 is about 1257.8871563161.

The spelling of 1990329813 in words is "one billion, nine hundred ninety million, three hundred twenty-nine thousand, eight hundred thirteen".