387681709 has 12 divisors (see below), whose sum is σ = 398387584. Its totient is φ = 377251704.

The previous prime is 387681689. The next prime is 387681713. The reversal of 387681709 is 907186783.

It is not a de Polignac number, because 387681709 - 2¹⁵ = 387648941 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 (387681739) 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 11 ways as a sum of consecutive naturals, for example, 492214 + ... + 493000.

Almost surely, 2^387681709 is an apocalyptic number.

It is an amenable number.

387681709 is a deficient number, since it is larger than the sum of its proper divisors (10705875).

387681709 is an equidigital number, since it uses as much as digits as its factorization.

387681709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104 (or 1057 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 387681709 is about 19689.6345572994. The cubic root of 387681709 is about 729.1638070281.

The spelling of 387681709 in words is "three hundred eighty-seven million, six hundred eighty-one thousand, seven hundred nine".