387221155 has 16 divisors (see below), whose sum is σ = 507873024. Its totient is φ = 282147840.

The previous prime is 387221147. The next prime is 387221161. The reversal of 387221155 is 551122783.

It is not a de Polignac number, because 387221155 - 2³ = 387221147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 387221155.

It is an unprimeable number.

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, 70842 + ... + 76111.

It is an arithmetic number, because the mean of its divisors is an integer number (31742064).

Almost surely, 2^387221155 is an apocalyptic number.

387221155 is a deficient number, since it is larger than the sum of its proper divisors (120651869).

387221155 is a wasteful number, since it uses less digits than its factorization.

387221155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147006.

The product of its digits is 16800, while the sum is 34.

The square root of 387221155 is about 19677.9357403159. The cubic root of 387221155 is about 728.8749511883.

The spelling of 387221155 in words is "three hundred eighty-seven million, two hundred twenty-one thousand, one hundred fifty-five".