387139 has 4 divisors (see below), whose sum is σ = 395424. Its totient is φ = 378856.

The previous prime is 387137. The next prime is 387151. The reversal of 387139 is 931783.

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

It is a cyclic number.

It is not a de Polignac number, because 387139 - 2¹ = 387137 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

387139 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 387139.

It is not an unprimeable number, because it can be changed into a prime (387137) 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, 4072 + ... + 4165.

It is an arithmetic number, because the mean of its divisors is an integer number (98856).

2³⁸⁷¹³⁹ is an apocalyptic number.

387139 is a deficient number, since it is larger than the sum of its proper divisors (8285).

387139 is an equidigital number, since it uses as much as digits as its factorization.

387139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8284.

The product of its digits is 4536, while the sum is 31.

The square root of 387139 is about 622.2049501571. The cubic root of 387139 is about 72.8823400151.

Subtracting 387139 from its reverse (931783), we obtain a square (544644 = 738²).

The spelling of 387139 in words is "three hundred eighty-seven thousand, one hundred thirty-nine".