390128889 has 8 divisors (see below), whose sum is σ = 523078560. Its totient is φ = 258632576.

The previous prime is 390128861. The next prime is 390128951. The reversal of 390128889 is 988821093.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 390128889 - 2⁵ = 390128857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (390128689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362712 + ... + 363785.

It is an arithmetic number, because the mean of its divisors is an integer number (65384820).

Almost surely, 2^390128889 is an apocalyptic number.

It is an amenable number.

390128889 is a deficient number, since it is larger than the sum of its proper divisors (132949671).

390128889 is a wasteful number, since it uses less digits than its factorization.

390128889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726679.

The product of its (nonzero) digits is 248832, while the sum is 48.

The square root of 390128889 is about 19751.6806626677. The cubic root of 390128889 is about 730.6948341431.

The spelling of 390128889 in words is "three hundred ninety million, one hundred twenty-eight thousand, eight hundred eighty-nine".