990890839 has 16 divisors (see below), whose sum is σ = 1031906304. Its totient is φ = 950796000.

The previous prime is 990890827. The next prime is 990890843. The reversal of 990890839 is 938098099.

It is a cyclic number.

It is not a de Polignac number, because 990890839 - 2⁷ = 990890711 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 990890839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990890819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1413189 + ... + 1413889.

It is an arithmetic number, because the mean of its divisors is an integer number (64494144).

Almost surely, 2^990890839 is an apocalyptic number.

990890839 is the 19909-th heptagonal number.

990890839 is a deficient number, since it is larger than the sum of its proper divisors (41015465).

990890839 is a wasteful number, since it uses less digits than its factorization.

990890839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The square root of 990890839 is about 31478.4186229232. The cubic root of 990890839 is about 996.9543464114.

The spelling of 990890839 in words is "nine hundred ninety million, eight hundred ninety thousand, eight hundred thirty-nine".