398929 has 4 divisors (see below), whose sum is σ = 400384. Its totient is φ = 397476.

The previous prime is 398921. The next prime is 398933. The reversal of 398929 is 929893.

It is a happy number.

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: 929893 = 67 ⋅13879.

It is a cyclic number.

It is not a de Polignac number, because 398929 - 2³ = 398921 is a prime.

It is a Duffinian number.

398929 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 398891 and 398900.

It is not an unprimeable number, because it can be changed into a prime (398921) 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, 177 + ... + 910.

It is an arithmetic number, because the mean of its divisors is an integer number (100096).

2³⁹⁸⁹²⁹ is an apocalyptic number.

It is an amenable number.

398929 is a deficient number, since it is larger than the sum of its proper divisors (1455).

398929 is a wasteful number, since it uses less digits than its factorization.

398929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454.

The product of its digits is 34992, while the sum is 40.

The square root of 398929 is about 631.6082646704. The cubic root of 398929 is about 73.6148112323.

The spelling of 398929 in words is "three hundred ninety-eight thousand, nine hundred twenty-nine".