1916144138 has 8 divisors (see below), whose sum is σ = 2878015332. Its totient is φ = 956805696.

The previous prime is 1916144119. The next prime is 1916144147. The reversal of 1916144138 is 8314416191.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1692252769 + 223891369 = 41137^2 + 14963^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631295 + ... + 634322.

Almost surely, 2^1916144138 is an apocalyptic number.

1916144138 is a deficient number, since it is larger than the sum of its proper divisors (961871194).

1916144138 is a wasteful number, since it uses less digits than its factorization.

1916144138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266376.

The product of its digits is 20736, while the sum is 38.

The square root of 1916144138 is about 43773.7836838444. The cubic root of 1916144138 is about 1242.0604267515.

The spelling of 1916144138 in words is "one billion, nine hundred sixteen million, one hundred forty-four thousand, one hundred thirty-eight".