1919726138 has 16 divisors (see below), whose sum is σ = 3165354720. Its totient is φ = 865940400.

The previous prime is 1919726131. The next prime is 1919726201. The reversal of 1919726138 is 8316279191.

It is a junction number, because it is equal to n+sod(n) for n = 1919726092 and 1919726101.

It is not an unprimeable number, because it can be changed into a prime (1919726131) 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, 330173 + ... + 335936.

It is an arithmetic number, because the mean of its divisors is an integer number (197834670).

Almost surely, 2^1919726138 is an apocalyptic number.

1919726138 is a deficient number, since it is larger than the sum of its proper divisors (1245628582).

1919726138 is a wasteful number, since it uses less digits than its factorization.

1919726138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666253.

The product of its digits is 163296, while the sum is 47.

The square root of 1919726138 is about 43814.6794807402. The cubic root of 1919726138 is about 1242.8339056197.

The spelling of 1919726138 in words is "one billion, nine hundred nineteen million, seven hundred twenty-six thousand, one hundred thirty-eight".