398636689 has 16 divisors (see below), whose sum is σ = 461353536. Its totient is φ = 340416000.

The previous prime is 398636683. The next prime is 398636747. The reversal of 398636689 is 986636893.

It is a cyclic number.

It is not a de Polignac number, because 398636689 - 2¹⁹ = 398112401 is a prime.

It is a super-2 number, since 2×398636689² = 317822419633765442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398636683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110614 + ... + 114160.

It is an arithmetic number, because the mean of its divisors is an integer number (28834596).

Almost surely, 2^398636689 is an apocalyptic number.

It is an amenable number.

398636689 is a deficient number, since it is larger than the sum of its proper divisors (62716847).

398636689 is a wasteful number, since it uses less digits than its factorization.

398636689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4176.

The product of its digits is 10077696, while the sum is 58.

The square root of 398636689 is about 19965.8881345158. Note that the first 3 decimals coincide. The cubic root of 398636689 is about 735.9682668118.

The spelling of 398636689 in words is "three hundred ninety-eight million, six hundred thirty-six thousand, six hundred eighty-nine".