19999380 has 24 divisors (see below), whose sum is σ = 55998432. Its totient is φ = 5333152.

The previous prime is 19999379. The next prime is 19999387. The reversal of 19999380 is 8399991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19999387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166602 + ... + 166721.

It is an arithmetic number, because the mean of its divisors is an integer number (2333268).

Almost surely, 2^19999380 is an apocalyptic number.

19999380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19999380 is an abundant number, since it is smaller than the sum of its proper divisors (35999052).

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

19999380 is a wasteful number, since it uses less digits than its factorization.

19999380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333335 (or 333333 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 48.

The square root of 19999380 is about 4472.0666363551. The cubic root of 19999380 is about 271.4389567323.

The spelling of 19999380 in words is "nineteen million, nine hundred ninety-nine thousand, three hundred eighty".