40405556 has 12 divisors (see below), whose sum is σ = 71765568. Its totient is φ = 19901112.

The previous prime is 40405543. The next prime is 40405559. The reversal of 40405556 is 65550404.

It is a pancake number, because a pancake can be divided into 40405556 parts by 8989 straight cuts.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40405559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75116 + ... + 75651.

It is an arithmetic number, because the mean of its divisors is an integer number (5980464).

Almost surely, 2^40405556 is an apocalyptic number.

It is an amenable number.

40405556 is a deficient number, since it is larger than the sum of its proper divisors (31360012).

40405556 is a wasteful number, since it uses less digits than its factorization.

40405556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150838 (or 150836 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 40405556 is about 6356.5364783033. The cubic root of 40405556 is about 343.1471232900.

The spelling of 40405556 in words is "forty million, four hundred five thousand, five hundred fifty-six".