19139780 has 48 divisors (see below), whose sum is σ = 44271360. Its totient is φ = 6950240.

The previous prime is 19139737. The next prime is 19139801. The reversal of 19139780 is 8793191.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26261 + ... + 26979.

It is an arithmetic number, because the mean of its divisors is an integer number (922320).

Almost surely, 2^19139780 is an apocalyptic number.

19139780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19139780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22135680).

19139780 is an abundant number, since it is smaller than the sum of its proper divisors (25131580).

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

19139780 is a wasteful number, since it uses less digits than its factorization.

19139780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761 (or 737 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 19139780 is about 4374.9034275056. The cubic root of 19139780 is about 267.4929336940.

The spelling of 19139780 in words is "nineteen million, one hundred thirty-nine thousand, seven hundred eighty".