1939185664 has 112 divisors (see below), whose sum is σ = 4238609760. Its totient is φ = 881786880.

The previous prime is 1939185653. The next prime is 1939185671. The reversal of 1939185664 is 4665819391.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13950907 + ... + 13951045.

It is an arithmetic number, because the mean of its divisors is an integer number (37844730).

Almost surely, 2^1939185664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1939185664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2119304880).

1939185664 is an abundant number, since it is smaller than the sum of its proper divisors (2299424096).

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

1939185664 is a wasteful number, since it uses less digits than its factorization.

1939185664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 285 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 52.

The square root of 1939185664 is about 44036.1858475504. The cubic root of 1939185664 is about 1247.0191723703.

The spelling of 1939185664 in words is "one billion, nine hundred thirty-nine million, one hundred eighty-five thousand, six hundred sixty-four".