398437 has 4 divisors (see below), whose sum is σ = 429100. Its totient is φ = 367776.

The previous prime is 398423. The next prime is 398441. The reversal of 398437 is 734893.

398437 = T₁₂₃ + T₁₂₄ + ... + T₁₆₁.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27556 + 370881 = 166^2 + 609^2 .

It is a cyclic number.

It is not a de Polignac number, because 398437 - 2¹⁵ = 365669 is a prime.

It is a super-3 number, since 3×398437³ = 189758063233318359, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15312 + ... + 15337.

It is an arithmetic number, because the mean of its divisors is an integer number (107275).

2³⁹⁸⁴³⁷ is an apocalyptic number.

It is an amenable number.

398437 is a deficient number, since it is larger than the sum of its proper divisors (30663).

398437 is a wasteful number, since it uses less digits than its factorization.

398437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30662.

The product of its digits is 18144, while the sum is 34.

The square root of 398437 is about 631.2186625885. The cubic root of 398437 is about 73.5845356806.

The spelling of 398437 in words is "three hundred ninety-eight thousand, four hundred thirty-seven".