404140 has 36 divisors (see below), whose sum is σ = 938448. Its totient is φ = 146080.

The previous prime is 404123. The next prime is 404161. The reversal of 404140 is 41404.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 404140.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2337 + ... + 2503.

It is an arithmetic number, because the mean of its divisors is an integer number (26068).

2⁴⁰⁴¹⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 404140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (469224).

404140 is an abundant number, since it is smaller than the sum of its proper divisors (534308).

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

404140 is a wasteful number, since it uses less digits than its factorization.

404140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 404140 is about 635.7200641792. The cubic root of 404140 is about 73.9339561706.

Adding to 404140 its reverse (41404), we get a palindrome (445544).

It can be divided in two parts, 40 and 4140, that multiplied together give a triangular number (165600 = T₅₇₅).

The spelling of 404140 in words is "four hundred four thousand, one hundred forty", and thus it is an iban number.