438742137818 has 32 divisors (see below), whose sum is σ = 671488272000. Its totient is φ = 214963854336.

The previous prime is 438742137817. The next prime is 438742137877. The reversal of 438742137818 is 818731247834.

It is a super-2 number, since 2×438742137818² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (438742137817) 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, 14393858 + ... + 14424306.

It is an arithmetic number, because the mean of its divisors is an integer number (20984008500).

Almost surely, 2^438742137818 is an apocalyptic number.

438742137818 is a deficient number, since it is larger than the sum of its proper divisors (232746134182).

438742137818 is a wasteful number, since it uses less digits than its factorization.

438742137818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31286.

The product of its digits is 7225344, while the sum is 56.

The spelling of 438742137818 in words is "four hundred thirty-eight billion, seven hundred forty-two million, one hundred thirty-seven thousand, eight hundred eighteen".