398404039 has 4 divisors (see below), whose sum is σ = 434622600. Its totient is φ = 362185480.

The previous prime is 398404003. The next prime is 398404057. The reversal of 398404039 is 930404893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 930404893 = 11 ⋅84582263.

It is a cyclic number.

It is not a de Polignac number, because 398404039 - 2²⁵ = 364849607 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 398403992 and 398404010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398404079) 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 3 ways as a sum of consecutive naturals, for example, 18109264 + ... + 18109285.

It is an arithmetic number, because the mean of its divisors is an integer number (108655650).

Almost surely, 2^398404039 is an apocalyptic number.

398404039 is a deficient number, since it is larger than the sum of its proper divisors (36218561).

398404039 is a wasteful number, since it uses less digits than its factorization.

398404039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36218560.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 398404039 is about 19960.0610971009. The cubic root of 398404039 is about 735.8250651261.

The spelling of 398404039 in words is "three hundred ninety-eight million, four hundred four thousand, thirty-nine".