1938932864 has 64 divisors (see below), whose sum is σ = 4224636000. Its totient is φ = 879083520.

The previous prime is 1938932857. The next prime is 1938932869. The reversal of 1938932864 is 4682398391.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1938932869) 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, 630659 + ... + 633725.

Almost surely, 2^1938932864 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 1938932864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2112318000).

1938932864 is an abundant number, since it is smaller than the sum of its proper divisors (2285703136).

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

1938932864 is a wasteful number, since it uses less digits than its factorization.

1938932864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3541 (or 3529 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 53.

The square root of 1938932864 is about 44033.3153873292. The cubic root of 1938932864 is about 1246.9649812128.

The spelling of 1938932864 in words is "one billion, nine hundred thirty-eight million, nine hundred thirty-two thousand, eight hundred sixty-four".