404121540 has 24 divisors (see below), whose sum is σ = 1131540480. Its totient is φ = 107765728.

The previous prime is 404121539. The next prime is 404121581. The reversal of 404121540 is 45121404.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3367620 + ... + 3367739.

It is an arithmetic number, because the mean of its divisors is an integer number (47147520).

Almost surely, 2^404121540 is an apocalyptic number.

It is an amenable number.

404121540 is an abundant number, since it is smaller than the sum of its proper divisors (727418940).

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

404121540 is a wasteful number, since it uses less digits than its factorization.

404121540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6735371 (or 6735369 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 404121540 is about 20102.7744353858. The cubic root of 404121540 is about 739.3283045380.

Adding to 404121540 its reverse (45121404), we get a palindrome (449242944).

The spelling of 404121540 in words is "four hundred four million, one hundred twenty-one thousand, five hundred forty".