19139140 has 24 divisors (see below), whose sum is σ = 40745880. Its totient is φ = 7550208.

The previous prime is 19139129. The next prime is 19139143. The reversal of 19139140 is 4193191.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1633284 + 17505856 = 1278^2 + 4184^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19139099 and 19139108.

It is not an unprimeable number, because it can be changed into a prime (19139143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5095 + ... + 8014.

It is an arithmetic number, because the mean of its divisors is an integer number (1697745).

Almost surely, 2^19139140 is an apocalyptic number.

19139140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19139140 is an abundant number, since it is smaller than the sum of its proper divisors (21606740).

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

19139140 is a wasteful number, since it uses less digits than its factorization.

19139140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13191 (or 13189 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 19139140 is about 4374.8302824224. The cubic root of 19139140 is about 267.4899521658.

The spelling of 19139140 in words is "nineteen million, one hundred thirty-nine thousand, one hundred forty".