398600639 has 4 divisors (see below), whose sum is σ = 419579640. Its totient is φ = 377621640.

The previous prime is 398600633. The next prime is 398600687. The reversal of 398600639 is 936006893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398600639 - 2²⁴ = 381823423 is a prime.

It is a super-2 number, since 2×398600639² = 317764938822416642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 398600639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398600633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10489472 + ... + 10489509.

It is an arithmetic number, because the mean of its divisors is an integer number (104894910).

Almost surely, 2^398600639 is an apocalyptic number.

398600639 is a deficient number, since it is larger than the sum of its proper divisors (20979001).

398600639 is a wasteful number, since it uses less digits than its factorization.

398600639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20979000.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 398600639 is about 19964.9853243122. The cubic root of 398600639 is about 735.9460808159.

The spelling of 398600639 in words is "three hundred ninety-eight million, six hundred thousand, six hundred thirty-nine".