1939085138 has 4 divisors (see below), whose sum is σ = 2908627710. Its totient is φ = 969542568.

The previous prime is 1939085117. The next prime is 1939085171. The reversal of 1939085138 is 8315809391.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1823887849 + 115197289 = 42707^2 + 10733^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1939085092 and 1939085101.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 484771283 + ... + 484771286.

Almost surely, 2^1939085138 is an apocalyptic number.

1939085138 is a deficient number, since it is larger than the sum of its proper divisors (969542572).

1939085138 is an equidigital number, since it uses as much as digits as its factorization.

1939085138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969542571.

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 1939085138 is about 44035.0444305442. The cubic root of 1939085138 is about 1246.9976238034.

The spelling of 1939085138 in words is "one billion, nine hundred thirty-nine million, eighty-five thousand, one hundred thirty-eight".