398539439 has 4 divisors (see below), whose sum is σ = 401448624. Its totient is φ = 395630256.

The previous prime is 398539399. The next prime is 398539499. The reversal of 398539439 is 934935893.

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 398539439 - 2¹² = 398535343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398539499) 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, 1454387 + ... + 1454660.

It is an arithmetic number, because the mean of its divisors is an integer number (100362156).

Almost surely, 2^398539439 is an apocalyptic number.

398539439 is a deficient number, since it is larger than the sum of its proper divisors (2909185).

398539439 is a wasteful number, since it uses less digits than its factorization.

398539439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2909184.

The product of its digits is 3149280, while the sum is 53.

The square root of 398539439 is about 19963.4525821562. The cubic root of 398539439 is about 735.9084138705.

The spelling of 398539439 in words is "three hundred ninety-eight million, five hundred thirty-nine thousand, four hundred thirty-nine".