404138540 has 24 divisors (see below), whose sum is σ = 913975440. Its totient is φ = 149220288.

The previous prime is 404138533. The next prime is 404138551. The reversal of 404138540 is 45831404.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 776930 + ... + 777449.

It is an arithmetic number, because the mean of its divisors is an integer number (38082310).

Almost surely, 2^404138540 is an apocalyptic number.

It is an amenable number.

404138540 is an abundant number, since it is smaller than the sum of its proper divisors (509836900).

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

404138540 is a wasteful number, since it uses less digits than its factorization.

404138540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554401 (or 1554399 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 404138540 is about 20103.1972581478. The cubic root of 404138540 is about 739.3386713903.

Adding to 404138540 its reverse (45831404), we get a palindrome (449969944).

The spelling of 404138540 in words is "four hundred four million, one hundred thirty-eight thousand, five hundred forty".