990669393 has 32 divisors (see below), whose sum is σ = 1679916800. Its totient is φ = 565221888.

The previous prime is 990669353. The next prime is 990669467. The reversal of 990669393 is 393966099.

It is not a de Polignac number, because 990669393 - 2⁸ = 990669137 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (990669313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130305 + ... + 137697.

It is an arithmetic number, because the mean of its divisors is an integer number (52497400).

Almost surely, 2^990669393 is an apocalyptic number.

It is an amenable number.

990669393 is a deficient number, since it is larger than the sum of its proper divisors (689247407).

990669393 is a wasteful number, since it uses less digits than its factorization.

990669393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8118 (or 8112 counting only the distinct ones).

The product of its (nonzero) digits is 2125764, while the sum is 54.

The square root of 990669393 is about 31474.9010006386. The cubic root of 990669393 is about 996.8800738505.

The spelling of 990669393 in words is "nine hundred ninety million, six hundred sixty-nine thousand, three hundred ninety-three".