780019138 has 8 divisors (see below), whose sum is σ = 1176493500. Its totient is φ = 387854640.

The previous prime is 780019133. The next prime is 780019187. The reversal of 780019138 is 831910087.

It can be written as a sum of positive squares in 2 ways, for example, as 628655329 + 151363809 = 25073^2 + 12303^2 .

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 = 780019097 and 780019106.

It is not an unprimeable number, because it can be changed into a prime (780019133) 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, 1077013 + ... + 1077736.

Almost surely, 2^780019138 is an apocalyptic number.

780019138 is a deficient number, since it is larger than the sum of its proper divisors (396474362).

780019138 is a wasteful number, since it uses less digits than its factorization.

780019138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2154932.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 780019138 is about 27928.8227105977. The cubic root of 780019138 is about 920.5239367554.

The spelling of 780019138 in words is "seven hundred eighty million, nineteen thousand, one hundred thirty-eight".