128389707 has 12 divisors (see below), whose sum is σ = 195212680. Its totient is φ = 81088128.

The previous prime is 128389697. The next prime is 128389711. The reversal of 128389707 is 707983821.

It is not a de Polignac number, because 128389707 - 2⁸ = 128389451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128389727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 375238 + ... + 375579.

Almost surely, 2^128389707 is an apocalyptic number.

128389707 is a deficient number, since it is larger than the sum of its proper divisors (66822973).

128389707 is a wasteful number, since it uses less digits than its factorization.

128389707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750842 (or 750839 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 128389707 is about 11330.9181887436. The cubic root of 128389707 is about 504.4793601626.

The spelling of 128389707 in words is "one hundred twenty-eight million, three hundred eighty-nine thousand, seven hundred seven".