1990518490 has 16 divisors (see below), whose sum is σ = 3583699200. Its totient is φ = 796037200.

The previous prime is 1990518487. The next prime is 1990518529. The reversal of 1990518490 is 948150991.

It is a self number, because there is not a number n which added to its sum of digits gives 1990518490.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34911 + ... + 72109.

It is an arithmetic number, because the mean of its divisors is an integer number (223981200).

Almost surely, 2^1990518490 is an apocalyptic number.

1990518490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1990518490 is a deficient number, since it is larger than the sum of its proper divisors (1593180710).

1990518490 is a wasteful number, since it uses less digits than its factorization.

1990518490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42557.

The product of its (nonzero) digits is 116640, while the sum is 46.

The square root of 1990518490 is about 44615.2271091384. The cubic root of 1990518490 is about 1257.9269029742.

The spelling of 1990518490 in words is "one billion, nine hundred ninety million, five hundred eighteen thousand, four hundred ninety".