128382387 has 16 divisors (see below), whose sum is σ = 196449792. Its totient is φ = 73054080.

The previous prime is 128382383. The next prime is 128382403. The reversal of 128382387 is 783283821.

It is not a de Polignac number, because 128382387 - 2² = 128382383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128382383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7623 + ... + 17744.

It is an arithmetic number, because the mean of its divisors is an integer number (12278112).

Almost surely, 2^128382387 is an apocalyptic number.

128382387 is a deficient number, since it is larger than the sum of its proper divisors (68067405).

128382387 is a wasteful number, since it uses less digits than its factorization.

128382387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25618.

The product of its digits is 129024, while the sum is 42.

The square root of 128382387 is about 11330.5951741292. The cubic root of 128382387 is about 504.4697725324.

It can be divided in two parts, 12838 and 2387, that added together give a triangular number (15225 = T₁₇₄).

The spelling of 128382387 in words is "one hundred twenty-eight million, three hundred eighty-two thousand, three hundred eighty-seven".