19638930 has 32 divisors (see below), whose sum is σ = 47386944. Its totient is φ = 5208896.

The previous prime is 19638929. The next prime is 19638937. The reversal of 19638930 is 3983691.

It is not an unprimeable number, because it can be changed into a prime (19638937) 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, 4249 + ... + 7571.

It is an arithmetic number, because the mean of its divisors is an integer number (1480842).

Almost surely, 2^19638930 is an apocalyptic number.

19638930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19638930 is an abundant number, since it is smaller than the sum of its proper divisors (27748014).

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

19638930 is a wasteful number, since it uses less digits than its factorization.

19638930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3530.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 19638930 is about 4431.5832385277. The cubic root of 19638930 is about 269.7983405043.

The spelling of 19638930 in words is "nineteen million, six hundred thirty-eight thousand, nine hundred thirty".