40398 has 8 divisors (see below), whose sum is σ = 80808. Its totient is φ = 13464.

The previous prime is 40387. The next prime is 40423. The reversal of 40398 is 89304.

It is a sphenic number, since it is the product of 3 distinct primes.

40398 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

40398 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 3 ways as a sum of consecutive naturals, for example, 3361 + ... + 3372.

It is an arithmetic number, because the mean of its divisors is an integer number (10101).

2⁴⁰³⁹⁸ is an apocalyptic number.

40398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40404).

40398 is a wasteful number, since it uses less digits than its factorization.

40398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6738.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 40398 is about 200.9925371749. The cubic root of 40398 is about 34.3125731997.

The spelling of 40398 in words is "forty thousand, three hundred ninety-eight".