9129420018 has 12 divisors (see below), whose sum is σ = 19780410078. Its totient is φ = 3043140000.

The previous prime is 9129420011. The next prime is 9129420043. The reversal of 9129420018 is 8100249219.

It can be written as a sum of positive squares in only one way, i.e., 4645376649 + 4484043369 = 68157^2 + 66963^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9129420011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 253594983 + ... + 253595018.

Almost surely, 2^9129420018 is an apocalyptic number.

9129420018 is an abundant number, since it is smaller than the sum of its proper divisors (10650990060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9129420018 is a wasteful number, since it uses less digits than its factorization.

9129420018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507190009 (or 507190006 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 9129420018 is about 95547.9985033700. The cubic root of 9129420018 is about 2090.0069456360.

The spelling of 9129420018 in words is "nine billion, one hundred twenty-nine million, four hundred twenty thousand, eighteen".