398617 has 4 divisors (see below), whose sum is σ = 400896. Its totient is φ = 396340.

The previous prime is 398611. The next prime is 398621. The reversal of 398617 is 716893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 716893 = 109 ⋅6577.

It is a cyclic number.

It is not a de Polignac number, because 398617 - 2³ = 398609 is a prime.

It is a super-3 number, since 3×398617³ = 190015357744653339, which contains 333 as substring.

It is a Duffinian number.

398617 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (398611) 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, 853 + ... + 1234.

It is an arithmetic number, because the mean of its divisors is an integer number (100224).

2³⁹⁸⁶¹⁷ is an apocalyptic number.

It is an amenable number.

398617 is a deficient number, since it is larger than the sum of its proper divisors (2279).

398617 is a wasteful number, since it uses less digits than its factorization.

398617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278.

The product of its digits is 9072, while the sum is 34.

The square root of 398617 is about 631.3612278245. The cubic root of 398617 is about 73.5956149916.

The spelling of 398617 in words is "three hundred ninety-eight thousand, six hundred seventeen".