1999641206 has 32 divisors (see below), whose sum is σ = 3336422400. Its totient is φ = 894516480.

The previous prime is 1999641181. The next prime is 1999641233. The reversal of 1999641206 is 6021469991.

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, 54566 + ... + 83526.

It is an arithmetic number, because the mean of its divisors is an integer number (104263200).

Almost surely, 2^1999641206 is an apocalyptic number.

1999641206 is a deficient number, since it is larger than the sum of its proper divisors (1336781194).

1999641206 is a wasteful number, since it uses less digits than its factorization.

1999641206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29084.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 1999641206 is about 44717.3479312000. The cubic root of 1999641206 is about 1259.8457033702.

The spelling of 1999641206 in words is "one billion, nine hundred ninety-nine million, six hundred forty-one thousand, two hundred six".