999423737890 has 16 divisors (see below), whose sum is σ = 1798977162240. Its totient is φ = 399766287600.

The previous prime is 999423737867. The next prime is 999423737891. The reversal of 999423737890 is 98737324999.

It is not an unprimeable number, because it can be changed into a prime (999423737891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1219615 + ... + 1867165.

It is an arithmetic number, because the mean of its divisors is an integer number (112436072640).

Almost surely, 2^999423737890 is an apocalyptic number.

999423737890 is a deficient number, since it is larger than the sum of its proper divisors (799553424350).

999423737890 is a wasteful number, since it uses less digits than its factorization.

999423737890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801897.

The product of its (nonzero) digits is 185177664, while the sum is 70.

The spelling of 999423737890 in words is "nine hundred ninety-nine billion, four hundred twenty-three million, seven hundred thirty-seven thousand, eight hundred ninety".