3128387 has 4 divisors (see below), whose sum is σ = 3212976. Its totient is φ = 3043800.

The previous prime is 3128381. The next prime is 3128393. The reversal of 3128387 is 7838213.

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

It is an interprime number because it is at equal distance from previous prime (3128381) and next prime (3128393).

It is a cyclic number.

It is not a de Polignac number, because 3128387 - 2⁸ = 3128131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3128381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42239 + ... + 42312.

It is an arithmetic number, because the mean of its divisors is an integer number (803244).

Almost surely, 2^3128387 is an apocalyptic number.

3128387 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

3128387 is a deficient number, since it is larger than the sum of its proper divisors (84589).

3128387 is an equidigital number, since it uses as much as digits as its factorization.

3128387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84588.

The product of its digits is 8064, while the sum is 32.

The square root of 3128387 is about 1768.7246817976. The cubic root of 3128387 is about 146.2536872959.

The spelling of 3128387 in words is "three million, one hundred twenty-eight thousand, three hundred eighty-seven".