387666221039 has 16 divisors (see below), whose sum is σ = 402797531136. Its totient is φ = 372701606400.

The previous prime is 387666221029. The next prime is 387666221113. The reversal of 387666221039 is 930122666783.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 387666221039 - 2¹² = 387666216943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387666221029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9458639 + ... + 9499535.

It is an arithmetic number, because the mean of its divisors is an integer number (25174845696).

Almost surely, 2^387666221039 is an apocalyptic number.

387666221039 is a deficient number, since it is larger than the sum of its proper divisors (15131310097).

387666221039 is a wasteful number, since it uses less digits than its factorization.

387666221039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42926.

The product of its (nonzero) digits is 3919104, while the sum is 53.

The spelling of 387666221039 in words is "three hundred eighty-seven billion, six hundred sixty-six million, two hundred twenty-one thousand, thirty-nine".