404140340 has 24 divisors (see below), whose sum is σ = 849072840. Its totient is φ = 161584128.

The previous prime is 404140277. The next prime is 404140349. The reversal of 404140340 is 43041404.

It can be written as a sum of positive squares in 4 ways, for example, as 5579044 + 398561296 = 2362^2 + 19964^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404140349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83096 + ... + 87824.

It is an arithmetic number, because the mean of its divisors is an integer number (35378035).

Almost surely, 2^404140340 is an apocalyptic number.

It is an amenable number.

404140340 is an abundant number, since it is smaller than the sum of its proper divisors (444932500).

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

404140340 is a wasteful number, since it uses less digits than its factorization.

404140340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9011 (or 9009 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 404140340 is about 20103.2420270960. The cubic root of 404140340 is about 739.3397690400.

Adding to 404140340 its reverse (43041404), we get a palindrome (447181744).

The spelling of 404140340 in words is "four hundred four million, one hundred forty thousand, three hundred forty".