19137791438 has 8 divisors (see below), whose sum is σ = 28722370800. Its totient is φ = 9563667840.

The previous prime is 19137791437. The next prime is 19137791501. The reversal of 19137791438 is 83419773191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×19137791438² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19137791438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19137791437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2609363 + ... + 2616686.

It is an arithmetic number, because the mean of its divisors is an integer number (3590296350).

Almost surely, 2^19137791438 is an apocalyptic number.

19137791438 is a deficient number, since it is larger than the sum of its proper divisors (9584579362).

19137791438 is a wasteful number, since it uses less digits than its factorization.

19137791438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5227882.

The product of its digits is 1143072, while the sum is 53.

The spelling of 19137791438 in words is "nineteen billion, one hundred thirty-seven million, seven hundred ninety-one thousand, four hundred thirty-eight".