398140 has 24 divisors (see below), whose sum is σ = 886032. Its totient is φ = 149760.

The previous prime is 398129. The next prime is 398143. The reversal of 398140 is 41893.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 398140.

It is not an unprimeable number, because it can be changed into a prime (398143) by changing a digit.

398140 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 in 7 ways as a sum of consecutive naturals, for example, 246 + ... + 925.

It is an arithmetic number, because the mean of its divisors is an integer number (36918).

2³⁹⁸¹⁴⁰ is an apocalyptic number.

It is an amenable number.

398140 is an abundant number, since it is smaller than the sum of its proper divisors (487892).

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

398140 is a wasteful number, since it uses less digits than its factorization.

398140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197 (or 1195 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 398140 is about 630.9833595270. The cubic root of 398140 is about 73.5662475199.

The spelling of 398140 in words is "three hundred ninety-eight thousand, one hundred forty".