387309 has 8 divisors (see below), whose sum is σ = 556192. Its totient is φ = 238320.

The previous prime is 387307. The next prime is 387313. The reversal of 387309 is 903783.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 387309 - 2¹ = 387307 is a prime.

It is a super-2 number, since 2×387309² = 300016522962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4927 + ... + 5004.

It is an arithmetic number, because the mean of its divisors is an integer number (69524).

2³⁸⁷³⁰⁹ is an apocalyptic number.

387309 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

387309 is a deficient number, since it is larger than the sum of its proper divisors (168883).

387309 is a wasteful number, since it uses less digits than its factorization.

387309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9947.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 387309 is about 622.3415460983. The cubic root of 387309 is about 72.8930064550.

It can be divided in two parts, 387 and 309, that added together give a palindrome (696).

The spelling of 387309 in words is "three hundred eighty-seven thousand, three hundred nine".