1930781238 has 8 divisors (see below), whose sum is σ = 3861562488. Its totient is φ = 643593744.

The previous prime is 1930781231. The next prime is 1930781257. The reversal of 1930781238 is 8321870391.

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

1930781238 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1930781238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1930781231) 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, 160898431 + ... + 160898442.

It is an arithmetic number, because the mean of its divisors is an integer number (482695311).

Almost surely, 2^1930781238 is an apocalyptic number.

1930781238 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1930781238 is a wasteful number, since it uses less digits than its factorization.

1930781238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321796878.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 1930781238 is about 43940.6558667483. The cubic root of 1930781238 is about 1245.2150374520.

The spelling of 1930781238 in words is "one billion, nine hundred thirty million, seven hundred eighty-one thousand, two hundred thirty-eight".