128406693 has 16 divisors (see below), whose sum is σ = 186436800. Its totient is φ = 78301440.

The previous prime is 128406683. The next prime is 128406697. The reversal of 128406693 is 396604821.

It is not a de Polignac number, because 128406693 - 2¹⁴ = 128390309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128406697) 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, 37188 + ... + 40493.

It is an arithmetic number, because the mean of its divisors is an integer number (11652300).

Almost surely, 2^128406693 is an apocalyptic number.

It is an amenable number.

128406693 is a deficient number, since it is larger than the sum of its proper divisors (58030107).

128406693 is a wasteful number, since it uses less digits than its factorization.

128406693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77732.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 128406693 is about 11331.6677060352. The cubic root of 128406693 is about 504.5016067760.

The spelling of 128406693 in words is "one hundred twenty-eight million, four hundred six thousand, six hundred ninety-three".