398540 has 12 divisors (see below), whose sum is σ = 836976. Its totient is φ = 159408.

The previous prime is 398539. The next prime is 398543. The reversal of 398540 is 45893.

It is a nialpdrome in base 9.

It is a zygodrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (398543) 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, 9944 + ... + 9983.

It is an arithmetic number, because the mean of its divisors is an integer number (69748).

2³⁹⁸⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

398540 is an abundant number, since it is smaller than the sum of its proper divisors (438436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398540 is a wasteful number, since it uses less digits than its factorization.

398540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19936 (or 19934 counting only the distinct ones).

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

The square root of 398540 is about 631.3002455251. The cubic root of 398540 is about 73.5908759168.

The spelling of 398540 in words is "three hundred ninety-eight thousand, five hundred forty".