19639124 has 6 divisors (see below), whose sum is σ = 34368474. Its totient is φ = 9819560.

The previous prime is 19639121. The next prime is 19639157. The reversal of 19639124 is 42193691.

It can be written as a sum of positive squares in only one way, i.e., 16810000 + 2829124 = 4100^2 + 1682^2 .

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19639121) by changing a digit.

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 as a sum of consecutive naturals, namely, 2454887 + ... + 2454894.

It is an arithmetic number, because the mean of its divisors is an integer number (5728079).

Almost surely, 2^19639124 is an apocalyptic number.

It is an amenable number.

19639124 is a deficient number, since it is larger than the sum of its proper divisors (14729350).

19639124 is a wasteful number, since it uses less digits than its factorization.

19639124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4909785 (or 4909783 counting only the distinct ones).

The product of its digits is 11664, while the sum is 35.

The square root of 19639124 is about 4431.6051268135. The cubic root of 19639124 is about 269.7992288878.

The spelling of 19639124 in words is "nineteen million, six hundred thirty-nine thousand, one hundred twenty-four".