1990345539 has 16 divisors (see below), whose sum is σ = 3266208512. Its totient is φ = 1049852448.

The previous prime is 1990345507. The next prime is 1990345541. The reversal of 1990345539 is 9355430991.

It is not a de Polignac number, because 1990345539 - 2⁵ = 1990345507 is a prime.

It is a super-2 number, since 2×1990345539² = 7922950729234401042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1990345639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3645049 + ... + 3645594.

It is an arithmetic number, because the mean of its divisors is an integer number (204138032).

Almost surely, 2^1990345539 is an apocalyptic number.

1990345539 is a deficient number, since it is larger than the sum of its proper divisors (1275862973).

1990345539 is a wasteful number, since it uses less digits than its factorization.

1990345539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7290666.

The product of its (nonzero) digits is 656100, while the sum is 48.

The square root of 1990345539 is about 44613.2888162260. The cubic root of 1990345539 is about 1257.8904692479.

The spelling of 1990345539 in words is "one billion, nine hundred ninety million, three hundred forty-five thousand, five hundred thirty-nine".