40505556 has 96 divisors (see below), whose sum is σ = 118854400. Its totient is φ = 10668672.

The previous prime is 40505539. The next prime is 40505567. The reversal of 40505556 is 65550504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53130 + ... + 53886.

Almost surely, 2^40505556 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 40505556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59427200).

40505556 is an abundant number, since it is smaller than the sum of its proper divisors (78348844).

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

40505556 is a wasteful number, since it uses less digits than its factorization.

40505556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 30.

The square root of 40505556 is about 6364.3975362952. The cubic root of 40505556 is about 343.4299758315.

The spelling of 40505556 in words is "forty million, five hundred five thousand, five hundred fifty-six".