438555155 has 4 divisors (see below), whose sum is σ = 526266192. Its totient is φ = 350844120.

The previous prime is 438555107. The next prime is 438555157. The reversal of 438555155 is 551555834.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551555834 = 2 ⋅275777917.

It is not a de Polignac number, because 438555155 - 2¹² = 438551059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (438555157) 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 3 ways as a sum of consecutive naturals, for example, 43855511 + ... + 43855520.

It is an arithmetic number, because the mean of its divisors is an integer number (131566548).

Almost surely, 2^438555155 is an apocalyptic number.

438555155 is a deficient number, since it is larger than the sum of its proper divisors (87711037).

438555155 is an equidigital number, since it uses as much as digits as its factorization.

438555155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87711036.

The product of its digits is 300000, while the sum is 41.

The square root of 438555155 is about 20941.7085024121. The cubic root of 438555155 is about 759.7570524242.

The spelling of 438555155 in words is "four hundred thirty-eight million, five hundred fifty-five thousand, one hundred fifty-five".