387445 has 4 divisors (see below), whose sum is σ = 464940. Its totient is φ = 309952.

The previous prime is 387437. The next prime is 387449. The reversal of 387445 is 544783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544783 = 71 ⋅7673.

It can be written as a sum of positive squares in 2 ways, for example, as 53361 + 334084 = 231^2 + 578^2 .

It is a cyclic number.

It is not a de Polignac number, because 387445 - 2³ = 387437 is a prime.

It is a super-2 number, since 2×387445² = 300227256050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387449) 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, 38740 + ... + 38749.

It is an arithmetic number, because the mean of its divisors is an integer number (116235).

2³⁸⁷⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

387445 is a deficient number, since it is larger than the sum of its proper divisors (77495).

387445 is an equidigital number, since it uses as much as digits as its factorization.

387445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77494.

The product of its digits is 13440, while the sum is 31.

The square root of 387445 is about 622.4508012687. The cubic root of 387445 is about 72.9015373599.

The spelling of 387445 in words is "three hundred eighty-seven thousand, four hundred forty-five".