387745 has 4 divisors (see below), whose sum is σ = 465300. Its totient is φ = 310192.

The previous prime is 387743. The next prime is 387749. The reversal of 387745 is 547783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547783 = 233 ⋅2351.

It can be written as a sum of positive squares in 2 ways, for example, as 91809 + 295936 = 303^2 + 544^2 .

It is a cyclic number.

It is not a de Polignac number, because 387745 - 2¹ = 387743 is a prime.

387745 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 387745.

It is not an unprimeable number, because it can be changed into a prime (387743) 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, 38770 + ... + 38779.

It is an arithmetic number, because the mean of its divisors is an integer number (116325).

2³⁸⁷⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

387745 is a deficient number, since it is larger than the sum of its proper divisors (77555).

387745 is an equidigital number, since it uses as much as digits as its factorization.

387745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77554.

The product of its digits is 23520, while the sum is 34.

The square root of 387745 is about 622.6917375395. The cubic root of 387745 is about 72.9203484762.

The spelling of 387745 in words is "three hundred eighty-seven thousand, seven hundred forty-five".