1990056990 has 64 divisors (see below), whose sum is σ = 4820175360. Its totient is φ = 525813120.

The previous prime is 1990056989. The next prime is 1990057001. The reversal of 1990056990 is 996500991.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2057487 + ... + 2058453.

It is an arithmetic number, because the mean of its divisors is an integer number (75315240).

Almost surely, 2^1990056990 is an apocalyptic number.

1990056990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1990056990 is an abundant number, since it is smaller than the sum of its proper divisors (2830118370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1990056990 is a wasteful number, since it uses less digits than its factorization.

1990056990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537.

The product of its (nonzero) digits is 196830, while the sum is 48.

The square root of 1990056990 is about 44610.0548083053. The cubic root of 1990056990 is about 1257.8296790365.

The spelling of 1990056990 in words is "one billion, nine hundred ninety million, fifty-six thousand, nine hundred ninety".