398422 has 4 divisors (see below), whose sum is σ = 597636. Its totient is φ = 199210.

The previous prime is 398417. The next prime is 398423. The reversal of 398422 is 224893.

398422 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 224893 = 17 ⋅13229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398423) by changing a digit.

398422 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99604 + ... + 99607.

It is an arithmetic number, because the mean of its divisors is an integer number (149409).

2³⁹⁸⁴²² is an apocalyptic number.

398422 is a deficient number, since it is larger than the sum of its proper divisors (199214).

398422 is a wasteful number, since it uses less digits than its factorization.

398422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199213.

The product of its digits is 3456, while the sum is 28.

The square root of 398422 is about 631.2067806987. The cubic root of 398422 is about 73.5836122540.

It can be divided in two parts, 398 and 422, that added together give a triangular number (820 = T₄₀).

The spelling of 398422 in words is "three hundred ninety-eight thousand, four hundred twenty-two".