19640872 has 32 divisors (see below), whose sum is σ = 37756800. Its totient is φ = 9576000.

The previous prime is 19640867. The next prime is 19640879. The reversal of 19640872 is 27804691.

It is not an unprimeable number, because it can be changed into a prime (19640879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85654 + ... + 85882.

It is an arithmetic number, because the mean of its divisors is an integer number (1179900).

Almost surely, 2^19640872 is an apocalyptic number.

It is an amenable number.

19640872 is a deficient number, since it is larger than the sum of its proper divisors (18115928).

19640872 is a wasteful number, since it uses less digits than its factorization.

19640872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 19640872 is about 4431.8023421628. The cubic root of 19640872 is about 269.8072332343.

The spelling of 19640872 in words is "nineteen million, six hundred forty thousand, eight hundred seventy-two".