9938817890 has 16 divisors (see below), whose sum is σ = 17901494208. Its totient is φ = 3972944496.

The previous prime is 9938817883. The next prime is 9938817947. The reversal of 9938817890 is 987188399.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306632 + ... + 337491.

It is an arithmetic number, because the mean of its divisors is an integer number (1118843388).

Almost surely, 2^9938817890 is an apocalyptic number.

9938817890 is a deficient number, since it is larger than the sum of its proper divisors (7962676318).

9938817890 is a wasteful number, since it uses less digits than its factorization.

9938817890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645673.

The product of its (nonzero) digits is 7838208, while the sum is 62.

The square root of 9938817890 is about 99693.6201068052. The cubic root of 9938817890 is about 2150.0319367890.

The spelling of 9938817890 in words is "nine billion, nine hundred thirty-eight million, eight hundred seventeen thousand, eight hundred ninety".