990386839 has 16 divisors (see below), whose sum is σ = 1083523392. Its totient is φ = 899728128.

The previous prime is 990386827. The next prime is 990386843. The reversal of 990386839 is 938683099.

It is not a de Polignac number, because 990386839 - 2¹³ = 990378647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990386839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990386819) 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, 613197 + ... + 614809.

It is an arithmetic number, because the mean of its divisors is an integer number (67720212).

Almost surely, 2^990386839 is an apocalyptic number.

990386839 is the 16822-nd nonagonal number.

990386839 is a deficient number, since it is larger than the sum of its proper divisors (93136553).

990386839 is a wasteful number, since it uses less digits than its factorization.

990386839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The square root of 990386839 is about 31470.4121199580. The cubic root of 990386839 is about 996.7852897118.

The spelling of 990386839 in words is "nine hundred ninety million, three hundred eighty-six thousand, eight hundred thirty-nine".