398432439 has 20 divisors (see below), whose sum is σ = 599748600. Its totient is φ = 263586960.

The previous prime is 398432423. The next prime is 398432459. The reversal of 398432439 is 934234893.

It is not a de Polignac number, because 398432439 - 2⁴ = 398432423 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 398432394 and 398432403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398432459) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8164 + ... + 29385.

It is an arithmetic number, because the mean of its divisors is an integer number (29987430).

Almost surely, 2^398432439 is an apocalyptic number.

398432439 is a deficient number, since it is larger than the sum of its proper divisors (201316161).

398432439 is a wasteful number, since it uses less digits than its factorization.

398432439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37692 (or 37683 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The square root of 398432439 is about 19960.7725050911. The cubic root of 398432439 is about 735.8425489978.

The spelling of 398432439 in words is "three hundred ninety-eight million, four hundred thirty-two thousand, four hundred thirty-nine".