249345128 has 8 divisors (see below), whose sum is σ = 467522130. Its totient is φ = 124672560.

The previous prime is 249345119. The next prime is 249345167. The reversal of 249345128 is 821543942.

249345128 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 144528484 + 104816644 = 12022^2 + 10238^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 249345091 and 249345100.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15584063 + ... + 15584078.

Almost surely, 2^249345128 is an apocalyptic number.

It is an amenable number.

249345128 is a deficient number, since it is larger than the sum of its proper divisors (218177002).

249345128 is a wasteful number, since it uses less digits than its factorization.

249345128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31168147 (or 31168143 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The square root of 249345128 is about 15790.6658504320. The cubic root of 249345128 is about 629.4099859453.

The spelling of 249345128 in words is "two hundred forty-nine million, three hundred forty-five thousand, one hundred twenty-eight".