990839218 has 12 divisors (see below), whose sum is σ = 1553689998. Its totient is φ = 473879120.

The previous prime is 990839197. The next prime is 990839219. The reversal of 990839218 is 812938099.

It can be written as a sum of positive squares in only one way, i.e., 582112129 + 408727089 = 24127^2 + 20217^2 .

It is not an unprimeable number, because it can be changed into a prime (990839219) 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, 467203 + ... + 469318.

Almost surely, 2^990839218 is an apocalyptic number.

990839218 is a deficient number, since it is larger than the sum of its proper divisors (562850780).

990839218 is a wasteful number, since it uses less digits than its factorization.

990839218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936569 (or 936546 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 49.

The square root of 990839218 is about 31477.5986695301. The cubic root of 990839218 is about 996.9370338168.

The spelling of 990839218 in words is "nine hundred ninety million, eight hundred thirty-nine thousand, two hundred eighteen".