9990234518 has 16 divisors (see below), whose sum is σ = 17309283984. Its totient is φ = 4273896960.

The previous prime is 9990234509. The next prime is 9990234533. The reversal of 9990234518 is 8154320999.

It is a happy number.

It is a congruent number.

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, 13355555 + ... + 13356302.

It is an arithmetic number, because the mean of its divisors is an integer number (1081830249).

Almost surely, 2^9990234518 is an apocalyptic number.

9990234518 is a deficient number, since it is larger than the sum of its proper divisors (7319049466).

9990234518 is a wasteful number, since it uses less digits than its factorization.

9990234518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26711887.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 9990234518 is about 99951.1606635961. The cubic root of 9990234518 is about 2153.7331585163.

The spelling of 9990234518 in words is "nine billion, nine hundred ninety million, two hundred thirty-four thousand, five hundred eighteen".