16668040 has 32 divisors (see below), whose sum is σ = 38799000. Its totient is φ = 6436864.

The previous prime is 16668037. The next prime is 16668079. The reversal of 16668040 is 4086661.

It can be written as a sum of positive squares in 4 ways, for example, as 14152644 + 2515396 = 3762^2 + 1586^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16667993 and 16668011.

It is an unprimeable number.

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, 6025 + ... + 8344.

Almost surely, 2^16668040 is an apocalyptic number.

16668040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16668040 is an abundant number, since it is smaller than the sum of its proper divisors (22130960).

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

16668040 is a wasteful number, since it uses less digits than its factorization.

16668040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14409 (or 14405 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 16668040 is about 4082.6510994696. The cubic root of 16668040 is about 255.4434932604.

The spelling of 16668040 in words is "sixteen million, six hundred sixty-eight thousand, forty".