398644989 has 8 divisors (see below), whose sum is σ = 531632640. Its totient is φ = 265710336.

The previous prime is 398644979. The next prime is 398645003. The reversal of 398644989 is 989446893.

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

It is not a de Polignac number, because 398644989 - 2⁵ = 398644957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398644949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10269 + ... + 30045.

It is an arithmetic number, because the mean of its divisors is an integer number (66454080).

Almost surely, 2^398644989 is an apocalyptic number.

It is an amenable number.

398644989 is a deficient number, since it is larger than the sum of its proper divisors (132987651).

398644989 is a wasteful number, since it uses less digits than its factorization.

398644989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26499.

The product of its digits is 13436928, while the sum is 60.

The square root of 398644989 is about 19966.0959879492. The cubic root of 398644989 is about 735.9733746325.

The spelling of 398644989 in words is "three hundred ninety-eight million, six hundred forty-four thousand, nine hundred eighty-nine".