128242388 has 12 divisors (see below), whose sum is σ = 234181920. Its totient is φ = 61333272.

The previous prime is 128242357. The next prime is 128242391. The reversal of 128242388 is 883242821.

It is a happy number.

It is a super-2 number, since 2×128242388² = 32892220159885088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696878 + ... + 697061.

It is an arithmetic number, because the mean of its divisors is an integer number (19515160).

Almost surely, 2^128242388 is an apocalyptic number.

It is an amenable number.

128242388 is a deficient number, since it is larger than the sum of its proper divisors (105939532).

128242388 is a wasteful number, since it uses less digits than its factorization.

128242388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393966 (or 1393964 counting only the distinct ones).

The product of its digits is 49152, while the sum is 38.

The square root of 128242388 is about 11324.4155699091. The cubic root of 128242388 is about 504.2863336853.

The spelling of 128242388 in words is "one hundred twenty-eight million, two hundred forty-two thousand, three hundred eighty-eight".