404540140 has 48 divisors (see below), whose sum is σ = 880941600. Its totient is φ = 155860992.

The previous prime is 404540137. The next prime is 404540141. The reversal of 404540140 is 41045404.

It is not an unprimeable number, because it can be changed into a prime (404540141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445567 + ... + 446473.

It is an arithmetic number, because the mean of its divisors is an integer number (18352950).

Almost surely, 2^404540140 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 404540140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (440470800).

404540140 is an abundant number, since it is smaller than the sum of its proper divisors (476401460).

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

404540140 is a wasteful number, since it uses less digits than its factorization.

404540140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714 (or 1712 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 404540140 is about 20113.1832388610. The cubic root of 404540140 is about 739.5834885212.

Adding to 404540140 its reverse (41045404), we get a palindrome (445585544).

The spelling of 404540140 in words is "four hundred four million, five hundred forty thousand, one hundred forty".