387213985 has 8 divisors (see below), whose sum is σ = 464820840. Its totient is φ = 309661824.

The previous prime is 387213979. The next prime is 387213989. The reversal of 387213985 is 589312783.

It can be written as a sum of positive squares in 4 ways, for example, as 40360609 + 346853376 = 6353^2 + 18624^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 387213985 - 2¹⁹ = 386689697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (387213989) 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 7 ways as a sum of consecutive naturals, for example, 3979 + ... + 28111.

It is an arithmetic number, because the mean of its divisors is an integer number (58102605).

Almost surely, 2^387213985 is an apocalyptic number.

It is an amenable number.

387213985 is a deficient number, since it is larger than the sum of its proper divisors (77606855).

387213985 is a wasteful number, since it uses less digits than its factorization.

387213985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27347.

The product of its digits is 362880, while the sum is 46.

The square root of 387213985 is about 19677.7535557289. The cubic root of 387213985 is about 728.8704524106.

The spelling of 387213985 in words is "three hundred eighty-seven million, two hundred thirteen thousand, nine hundred eighty-five".