1939648789 has 8 divisors (see below), whose sum is σ = 2160882360. Its totient is φ = 1728705216.

The previous prime is 1939648771. The next prime is 1939648883. The reversal of 1939648789 is 9878469391.

It can be written as a sum of positive squares in 4 ways, for example, as 543356100 + 1396292689 = 23310^2 + 37367^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1939648789 - 2⁵ = 1939648757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1939648789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1939648759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2572102 + ... + 2572855.

It is an arithmetic number, because the mean of its divisors is an integer number (270110295).

Almost surely, 2^1939648789 is an apocalyptic number.

It is an amenable number.

1939648789 is a deficient number, since it is larger than the sum of its proper divisors (221233571).

1939648789 is a wasteful number, since it uses less digits than its factorization.

1939648789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5144999.

The product of its digits is 23514624, while the sum is 64.

The square root of 1939648789 is about 44041.4439931299. The cubic root of 1939648789 is about 1247.1184373685.

The spelling of 1939648789 in words is "one billion, nine hundred thirty-nine million, six hundred forty-eight thousand, seven hundred eighty-nine".