1938309966 has 32 divisors (see below), whose sum is σ = 4534060800. Its totient is φ = 612097560.

The previous prime is 1938309931. The next prime is 1938310007. The reversal of 1938309966 is 6699038391.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 943570 + ... + 945621.

It is an arithmetic number, because the mean of its divisors is an integer number (141689400).

Almost surely, 2^1938309966 is an apocalyptic number.

1938309966 is an abundant number, since it is smaller than the sum of its proper divisors (2595750834).

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

1938309966 is a wasteful number, since it uses less digits than its factorization.

1938309966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889221 (or 1889215 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 54.

The square root of 1938309966 is about 44026.2417882790. The cubic root of 1938309966 is about 1246.8314343532.

The spelling of 1938309966 in words is "one billion, nine hundred thirty-eight million, three hundred nine thousand, nine hundred sixty-six".