128239430 has 24 divisors (see below), whose sum is σ = 253725696. Its totient is φ = 46632080.

The previous prime is 128239427. The next prime is 128239439. The reversal of 128239430 is 34932821.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128239439) 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, 51782 + ... + 54201.

It is an arithmetic number, because the mean of its divisors is an integer number (10571904).

Almost surely, 2^128239430 is an apocalyptic number.

128239430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128239430 is a deficient number, since it is larger than the sum of its proper divisors (125486266).

128239430 is a wasteful number, since it uses less digits than its factorization.

128239430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106012 (or 106001 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 128239430 is about 11324.2849663897. The cubic root of 128239430 is about 504.2824564170.

The spelling of 128239430 in words is "one hundred twenty-eight million, two hundred thirty-nine thousand, four hundred thirty".