1999445206 has 32 divisors (see below), whose sum is σ = 3317529600. Its totient is φ = 896222880.

The previous prime is 1999445197. The next prime is 1999445233. The reversal of 1999445206 is 6025449991.

It is a super-2 number, since 2×1999445206² = 7995562263592764872, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1999445206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 532885 + ... + 536623.

It is an arithmetic number, because the mean of its divisors is an integer number (103672800).

Almost surely, 2^1999445206 is an apocalyptic number.

1999445206 is a deficient number, since it is larger than the sum of its proper divisors (1318084394).

1999445206 is a wasteful number, since it uses less digits than its factorization.

1999445206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4084.

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 1999445206 is about 44715.1563342901. The cubic root of 1999445206 is about 1259.8045396812.

The spelling of 1999445206 in words is "one billion, nine hundred ninety-nine million, four hundred forty-five thousand, two hundred six".