1669438920 has 32 divisors (see below), whose sum is σ = 5008317120. Its totient is φ = 445183680.

The previous prime is 1669438907. The next prime is 1669438921. The reversal of 1669438920 is 298349661.

It is a super-2 number, since 2×1669438920² = 5574052615221532800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1669438920.

It is not an unprimeable number, because it can be changed into a prime (1669438921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6955876 + ... + 6956115.

It is an arithmetic number, because the mean of its divisors is an integer number (156509910).

Almost surely, 2^1669438920 is an apocalyptic number.

1669438920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1669438920 is an abundant number, since it is smaller than the sum of its proper divisors (3338878200).

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

1669438920 is a wasteful number, since it uses less digits than its factorization.

1669438920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13912005 (or 13912001 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 1669438920 is about 40858.7679696782. The cubic root of 1669438920 is about 1186.2881113063.

The spelling of 1669438920 in words is "one billion, six hundred sixty-nine million, four hundred thirty-eight thousand, nine hundred twenty".