387218141 has 4 divisors (see below), whose sum is σ = 387961884. Its totient is φ = 386474400.

The previous prime is 387218131. The next prime is 387218147. The reversal of 387218141 is 141812783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 141812783 = 7 ⋅20258969.

It can be written as a sum of positive squares in 2 ways, for example, as 77810041 + 309408100 = 8821^2 + 17590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387218141 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387218147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371090 + ... + 372131.

It is an arithmetic number, because the mean of its divisors is an integer number (96990471).

Almost surely, 2^387218141 is an apocalyptic number.

It is an amenable number.

387218141 is a deficient number, since it is larger than the sum of its proper divisors (743743).

387218141 is an equidigital number, since it uses as much as digits as its factorization.

387218141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743742.

The product of its digits is 10752, while the sum is 35.

The square root of 387218141 is about 19677.8591569307. The cubic root of 387218141 is about 728.8730600771.

The spelling of 387218141 in words is "three hundred eighty-seven million, two hundred eighteen thousand, one hundred forty-one".