398045 has 4 divisors (see below), whose sum is σ = 477660. Its totient is φ = 318432.

The previous prime is 398039. The next prime is 398053. The reversal of 398045 is 540893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 540893 = 127 ⋅4259.

It can be written as a sum of positive squares in 2 ways, for example, as 219961 + 178084 = 469^2 + 422^2 .

It is a cyclic number.

It is not a de Polignac number, because 398045 - 2⁴ = 398029 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 397999 and 398017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39800 + ... + 39809.

It is an arithmetic number, because the mean of its divisors is an integer number (119415).

2³⁹⁸⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

398045 is a deficient number, since it is larger than the sum of its proper divisors (79615).

398045 is an equidigital number, since it uses as much as digits as its factorization.

398045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79614.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 398045 is about 630.9080757131. The cubic root of 398045 is about 73.5603958518.

The spelling of 398045 in words is "three hundred ninety-eight thousand, forty-five".