1899309668 has 24 divisors (see below), whose sum is σ = 3401201664. Its totient is φ = 927617600.

The previous prime is 1899309661. The next prime is 1899309689. The reversal of 1899309668 is 8669039981.

It is not an unprimeable number, because it can be changed into a prime (1899309661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88253 + ... + 107643.

It is an arithmetic number, because the mean of its divisors is an integer number (141716736).

Almost surely, 2^1899309668 is an apocalyptic number.

It is an amenable number.

1899309668 is a deficient number, since it is larger than the sum of its proper divisors (1501891996).

1899309668 is a wasteful number, since it uses less digits than its factorization.

1899309668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19963 (or 19961 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 59.

The square root of 1899309668 is about 43581.0700648802. The cubic root of 1899309668 is about 1238.4123080893.

The spelling of 1899309668 in words is "one billion, eight hundred ninety-nine million, three hundred nine thousand, six hundred sixty-eight".