128699438 has 16 divisors (see below), whose sum is σ = 223651680. Its totient is φ = 54400896.

The previous prime is 128699437. The next prime is 128699443. The reversal of 128699438 is 834996821.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128699437) 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, 61943 + ... + 63986.

It is an arithmetic number, because the mean of its divisors is an integer number (13978230).

Almost surely, 2^128699438 is an apocalyptic number.

128699438 is a deficient number, since it is larger than the sum of its proper divisors (94952242).

128699438 is a wasteful number, since it uses less digits than its factorization.

128699438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126011.

The product of its digits is 746496, while the sum is 50.

The square root of 128699438 is about 11344.5774711974. The cubic root of 128699438 is about 504.8847078570.

The spelling of 128699438 in words is "one hundred twenty-eight million, six hundred ninety-nine thousand, four hundred thirty-eight".