389129440 has 48 divisors (see below), whose sum is σ = 1050652512. Its totient is φ = 133415424.

The previous prime is 389129423. The next prime is 389129441. The reversal of 389129440 is 44921983.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 389129393 and 389129402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389129441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172599 + ... + 174838.

It is an arithmetic number, because the mean of its divisors is an integer number (21888594).

Almost surely, 2^389129440 is an apocalyptic number.

It is an amenable number.

389129440 is an abundant number, since it is smaller than the sum of its proper divisors (661523072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

389129440 is a wasteful number, since it uses less digits than its factorization.

389129440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347459 (or 347451 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 389129440 is about 19726.3640846457. The cubic root of 389129440 is about 730.0703253698.

The spelling of 389129440 in words is "three hundred eighty-nine million, one hundred twenty-nine thousand, four hundred forty".