919943138 has 8 divisors (see below), whose sum is σ = 1380999132. Its totient is φ = 459610096.

The previous prime is 919943137. The next prime is 919943183. The reversal of 919943138 is 831349919.

It can be written as a sum of positive squares in 2 ways, for example, as 919120489 + 822649 = 30317^2 + 907^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 919943092 and 919943101.

It is not an unprimeable number, because it can be changed into a prime (919943131) 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, 177545 + ... + 182652.

Almost surely, 2^919943138 is an apocalyptic number.

919943138 is a deficient number, since it is larger than the sum of its proper divisors (461055994).

919943138 is a wasteful number, since it uses less digits than its factorization.

919943138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361476.

The product of its digits is 209952, while the sum is 47.

The square root of 919943138 is about 30330.5644194103. The cubic root of 919943138 is about 972.5687883619.

The spelling of 919943138 in words is "nine hundred nineteen million, nine hundred forty-three thousand, one hundred thirty-eight".