19388880142 has 4 divisors (see below), whose sum is σ = 29083320216. Its totient is φ = 9694440070.

The previous prime is 19388880139. The next prime is 19388880143. The reversal of 19388880142 is 24108888391.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 19388880142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19388880143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4847220034 + ... + 4847220037.

It is an arithmetic number, because the mean of its divisors is an integer number (7270830054).

Almost surely, 2^19388880142 is an apocalyptic number.

19388880142 is a deficient number, since it is larger than the sum of its proper divisors (9694440074).

19388880142 is an equidigital number, since it uses as much as digits as its factorization.

19388880142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9694440073.

The product of its (nonzero) digits is 884736, while the sum is 52.

The spelling of 19388880142 in words is "nineteen billion, three hundred eighty-eight million, eight hundred eighty thousand, one hundred forty-two".