39390069842 has 6 divisors (see below), whose sum is σ = 59085525783. Its totient is φ = 19694894582.

The previous prime is 39390069839. The next prime is 39390069923. The reversal of 39390069842 is 24896009393.

It can be written as a sum of positive squares in only one way, i.e., 19695034921 + 19695034921 = 140339^2 + 140339^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=140339.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 210509 + ... + 350847.

Almost surely, 2^39390069842 is an apocalyptic number.

39390069842 is a deficient number, since it is larger than the sum of its proper divisors (19695455941).

39390069842 is an frugal number, since it uses more digits than its factorization.

39390069842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280680 (or 140341 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 53.

The spelling of 39390069842 in words is "thirty-nine billion, three hundred ninety million, sixty-nine thousand, eight hundred forty-two".