398434 has 8 divisors (see below), whose sum is σ = 606060. Its totient is φ = 196416.

The previous prime is 398423. The next prime is 398441. The reversal of 398434 is 434893.

It can be written as a sum of positive squares in 2 ways, for example, as 356409 + 42025 = 597^2 + 205^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 398396 and 398405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1219 + ... + 1510.

2³⁹⁸⁴³⁴ is an apocalyptic number.

398434 is a deficient number, since it is larger than the sum of its proper divisors (207626).

398434 is a wasteful number, since it uses less digits than its factorization.

398434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2804.

The product of its digits is 10368, while the sum is 31.

The square root of 398434 is about 631.2162862284. The cubic root of 398434 is about 73.5843509971.

The spelling of 398434 in words is "three hundred ninety-eight thousand, four hundred thirty-four".