19638428 has 12 divisors (see below), whose sum is σ = 34413120. Its totient is φ = 9806112.

The previous prime is 19638413. The next prime is 19638431. The reversal of 19638428 is 82483691.

It is a super-2 number, since 2×19638428² = 771335708622368, which contains 22 as substring.

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, 608 + ... + 6296.

It is an arithmetic number, because the mean of its divisors is an integer number (2867760).

Almost surely, 2^19638428 is an apocalyptic number.

It is an amenable number.

19638428 is a deficient number, since it is larger than the sum of its proper divisors (14774692).

19638428 is a wasteful number, since it uses less digits than its factorization.

19638428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6556 (or 6554 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 19638428 is about 4431.5265992658. The cubic root of 19638428 is about 269.7960416703.

The spelling of 19638428 in words is "nineteen million, six hundred thirty-eight thousand, four hundred twenty-eight".