42939646838 has 32 divisors (see below), whose sum is σ = 73346549760. Its totient is φ = 18676152000.

The previous prime is 42939646837. The next prime is 42939646859. The reversal of 42939646838 is 83864693924.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42939646831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 293018 + ... + 414413.

It is an arithmetic number, because the mean of its divisors is an integer number (2292079680).

Almost surely, 2^42939646838 is an apocalyptic number.

42939646838 is a deficient number, since it is larger than the sum of its proper divisors (30406902922).

42939646838 is a wasteful number, since it uses less digits than its factorization.

42939646838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707564.

The product of its digits is 53747712, while the sum is 62.

The spelling of 42939646838 in words is "forty-two billion, nine hundred thirty-nine million, six hundred forty-six thousand, eight hundred thirty-eight".