39378509946 has 24 divisors (see below), whose sum is σ = 90338935284. Its totient is φ = 12354042240.

The previous prime is 39378509941. The next prime is 39378509959. The reversal of 39378509946 is 64990587393.

39378509946 is a `hidden beast` number, since 3 + 9 + 37 + 8 + 509 + 94 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 32009145921 + 7369364025 = 178911^2 + 85845^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (39378509941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64343665 + ... + 64344276.

Almost surely, 2^39378509946 is an apocalyptic number.

39378509946 is an abundant number, since it is smaller than the sum of its proper divisors (50960425338).

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

39378509946 is a wasteful number, since it uses less digits than its factorization.

39378509946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128687966 (or 128687963 counting only the distinct ones).

The product of its (nonzero) digits is 44089920, while the sum is 63.

The spelling of 39378509946 in words is "thirty-nine billion, three hundred seventy-eight million, five hundred nine thousand, nine hundred forty-six".