19640308 has 12 divisors (see below), whose sum is σ = 35555940. Its totient is φ = 9481472.

The previous prime is 19640297. The next prime is 19640311. The reversal of 19640308 is 80304691.

It can be written as a sum of positive squares in 2 ways, for example, as 11102224 + 8538084 = 3332^2 + 2922^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19640308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84541 + ... + 84772.

It is an arithmetic number, because the mean of its divisors is an integer number (2962995).

Almost surely, 2^19640308 is an apocalyptic number.

It is an amenable number.

19640308 is a deficient number, since it is larger than the sum of its proper divisors (15915632).

19640308 is a wasteful number, since it uses less digits than its factorization.

19640308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169346 (or 169344 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 19640308 is about 4431.7387107094. The cubic root of 19640308 is about 269.8046506481.

Adding to 19640308 its reverse (80304691), we get a palindrome (99944999).

It can be divided in two parts, 196 and 40308, that added together give a palindrome (40504).

The spelling of 19640308 in words is "nineteen million, six hundred forty thousand, three hundred eight".