42405556 has 6 divisors (see below), whose sum is σ = 74209730. Its totient is φ = 21202776.

The previous prime is 42405527. The next prime is 42405619. The reversal of 42405556 is 65550424.

It can be written as a sum of positive squares in only one way, i.e., 34621456 + 7784100 = 5884^2 + 2790^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300691 + ... + 5300698.

Almost surely, 2^42405556 is an apocalyptic number.

It is an amenable number.

42405556 is a deficient number, since it is larger than the sum of its proper divisors (31804174).

42405556 is a wasteful number, since it uses less digits than its factorization.

42405556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10601393 (or 10601391 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 42405556 is about 6511.9548524233. The cubic root of 42405556 is about 348.7179106577.

The spelling of 42405556 in words is "forty-two million, four hundred five thousand, five hundred fifty-six".