128723384 has 8 divisors (see below), whose sum is σ = 241356360. Its totient is φ = 64361688.

The previous prime is 128723383. The next prime is 128723393. The reversal of 128723384 is 483327821.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×128723384² = 33139419176822912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128723383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8045204 + ... + 8045219.

It is an arithmetic number, because the mean of its divisors is an integer number (30169545).

Almost surely, 2^128723384 is an apocalyptic number.

It is an amenable number.

128723384 is a deficient number, since it is larger than the sum of its proper divisors (112632976).

128723384 is a wasteful number, since it uses less digits than its factorization.

128723384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16090429 (or 16090425 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 128723384 is about 11345.6328161985. The cubic root of 128723384 is about 504.9160191035.

The spelling of 128723384 in words is "one hundred twenty-eight million, seven hundred twenty-three thousand, three hundred eighty-four".