16640452 has 6 divisors (see below), whose sum is σ = 29120798. Its totient is φ = 8320224.

The previous prime is 16640413. The next prime is 16640453. The reversal of 16640452 is 25404661.

It can be written as a sum of positive squares in only one way, i.e., 12503296 + 4137156 = 3536^2 + 2034^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16640452.

It is not an unprimeable number, because it can be changed into a prime (16640453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2080053 + ... + 2080060.

Almost surely, 2^16640452 is an apocalyptic number.

It is an amenable number.

16640452 is a deficient number, since it is larger than the sum of its proper divisors (12480346).

16640452 is a wasteful number, since it uses less digits than its factorization.

16640452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4160117 (or 4160115 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 16640452 is about 4079.2710133062. The cubic root of 16640452 is about 255.3024835456.

The spelling of 16640452 in words is "sixteen million, six hundred forty thousand, four hundred fifty-two".