19938906 has 32 divisors (see below), whose sum is σ = 47718720. Its totient is φ = 6134832.

The previous prime is 19938901. The next prime is 19938911. The reversal of 19938906 is 60983991.

It is an interprime number because it is at equal distance from previous prime (19938901) and next prime (19938911).

It is not an unprimeable number, because it can be changed into a prime (19938901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13500 + ... + 14903.

It is an arithmetic number, because the mean of its divisors is an integer number (1491210).

Almost surely, 2^19938906 is an apocalyptic number.

19938906 is an abundant number, since it is smaller than the sum of its proper divisors (27779814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19938906 is a wasteful number, since it uses less digits than its factorization.

19938906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28427 (or 28421 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 19938906 is about 4465.3002138714. The cubic root of 19938906 is about 271.1650887006.

The spelling of 19938906 in words is "nineteen million, nine hundred thirty-eight thousand, nine hundred six".