990385858 has 32 divisors (see below), whose sum is σ = 1854379008. Its totient is φ = 385400400.

The previous prime is 990385853. The next prime is 990385867. The reversal of 990385858 is 858583099.

It is a junction number, because it is equal to n+sod(n) for n = 990385799 and 990385808.

It is not an unprimeable number, because it can be changed into a prime (990385853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142443 + ... + 149233.

It is an arithmetic number, because the mean of its divisors is an integer number (57949344).

Almost surely, 2^990385858 is an apocalyptic number.

990385858 is a deficient number, since it is larger than the sum of its proper divisors (863993150).

990385858 is a wasteful number, since it uses less digits than its factorization.

990385858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7758.

The product of its (nonzero) digits is 3110400, while the sum is 55.

The square root of 990385858 is about 31470.3965338856. The cubic root of 990385858 is about 996.7849605990.

The spelling of 990385858 in words is "nine hundred ninety million, three hundred eighty-five thousand, eight hundred fifty-eight".