4001669920 has 48 divisors (see below), whose sum is σ = 9508658040. Its totient is φ = 1591404544.

The previous prime is 4001669891. The next prime is 4001669921. The reversal of 4001669920 is 299661004.

It can be written as a sum of positive squares in 4 ways, for example, as 3929283856 + 72386064 = 62684^2 + 8508^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 4001669920.

It is not an unprimeable number, because it can be changed into a prime (4001669921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44605 + ... + 99964.

Almost surely, 2^4001669920 is an apocalyptic number.

4001669920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4001669920 is an abundant number, since it is smaller than the sum of its proper divisors (5506988120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4001669920 is a wasteful number, since it uses less digits than its factorization.

4001669920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144757 (or 144749 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 4001669920 is about 63258.7537025509. The cubic root of 4001669920 is about 1587.6219239649.

The spelling of 4001669920 in words is "four billion, one million, six hundred sixty-nine thousand, nine hundred twenty".