1916619138 has 32 divisors (see below), whose sum is σ = 4867605120. Its totient is φ = 547605360.

The previous prime is 1916619137. The next prime is 1916619143. The reversal of 1916619138 is 8319166191.

1916619138 is a `hidden beast` number, since 1 + 9 + 16 + 619 + 13 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1916619093 and 1916619102.

It is not an unprimeable number, because it can be changed into a prime (1916619137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2534833 + ... + 2535588.

It is an arithmetic number, because the mean of its divisors is an integer number (152112660).

Almost surely, 2^1916619138 is an apocalyptic number.

1916619138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1916619138 is an abundant number, since it is smaller than the sum of its proper divisors (2950985982).

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

1916619138 is a wasteful number, since it uses less digits than its factorization.

1916619138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5070439 (or 5070433 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 1916619138 is about 43779.2089695554. The cubic root of 1916619138 is about 1242.1630512440.

The spelling of 1916619138 in words is "one billion, nine hundred sixteen million, six hundred nineteen thousand, one hundred thirty-eight".