1938715985 has 8 divisors (see below), whose sum is σ = 2326819776. Its totient is φ = 1550732400.

The previous prime is 1938715981. The next prime is 1938715993. The reversal of 1938715985 is 5895178391.

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

It is not a de Polignac number, because 1938715985 - 2² = 1938715981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1938715985.

It is not an unprimeable number, because it can be changed into a prime (1938715981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10382 + ... + 63128.

It is an arithmetic number, because the mean of its divisors is an integer number (290852472).

Almost surely, 2^1938715985 is an apocalyptic number.

It is an amenable number.

1938715985 is a deficient number, since it is larger than the sum of its proper divisors (388103791).

1938715985 is an equidigital number, since it uses as much as digits as its factorization.

1938715985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60103.

The product of its digits is 2721600, while the sum is 56.

The square root of 1938715985 is about 44030.8526490233. The cubic root of 1938715985 is about 1246.9184864618.

It can be divided in two parts, 193 and 8715985, that added together give a palindrome (8716178).

The spelling of 1938715985 in words is "one billion, nine hundred thirty-eight million, seven hundred fifteen thousand, nine hundred eighty-five".