438426138 has 32 divisors (see below), whose sum is σ = 917070336. Its totient is φ = 139468208.

The previous prime is 438426137. The next prime is 438426143. The reversal of 438426138 is 831624834.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 438426096 and 438426105.

It is not an unprimeable number, because it can be changed into a prime (438426137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61045 + ... + 67847.

It is an arithmetic number, because the mean of its divisors is an integer number (28658448).

Almost surely, 2^438426138 is an apocalyptic number.

438426138 is an abundant number, since it is smaller than the sum of its proper divisors (478644198).

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

438426138 is a wasteful number, since it uses less digits than its factorization.

438426138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7298.

The product of its digits is 110592, while the sum is 39.

The square root of 438426138 is about 20938.6278920086. The cubic root of 438426138 is about 759.6825416979.

The spelling of 438426138 in words is "four hundred thirty-eight million, four hundred twenty-six thousand, one hundred thirty-eight".