387649 has 4 divisors (see below), whose sum is σ = 398164. Its totient is φ = 377136.

The previous prime is 387641. The next prime is 387659. The reversal of 387649 is 946783.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 322624 + 65025 = 568^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 387649 - 2³ = 387641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 10477 = 387649 / (3 + 8 + 7 + 6 + 4 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5202 + ... + 5275.

It is an arithmetic number, because the mean of its divisors is an integer number (99541).

2³⁸⁷⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

387649 is a deficient number, since it is larger than the sum of its proper divisors (10515).

387649 is a wasteful number, since it uses less digits than its factorization.

387649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10514.

The product of its digits is 36288, while the sum is 37.

The square root of 387649 is about 622.6146480770. The cubic root of 387649 is about 72.9143299750.

The spelling of 387649 in words is "three hundred eighty-seven thousand, six hundred forty-nine".