1999017405628 has 12 divisors (see below), whose sum is σ = 3501434913480. Its totient is φ = 998607430352.

The previous prime is 1999017405599. The next prime is 1999017405643. The reversal of 1999017405628 is 8265047109991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225313126 + ... + 225321997.

It is an arithmetic number, because the mean of its divisors is an integer number (291786242790).

Almost surely, 2^{1999017405628} is an apocalyptic number.

It is an amenable number.

1999017405628 is a deficient number, since it is larger than the sum of its proper divisors (1502417507852).

1999017405628 is a wasteful number, since it uses less digits than its factorization.

1999017405628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450636236 (or 450636234 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 61.

The spelling of 1999017405628 in words is "one trillion, nine hundred ninety-nine billion, seventeen million, four hundred five thousand, six hundred twenty-eight".