42550405 has 16 divisors (see below), whose sum is σ = 56911680. Its totient is φ = 30350592.

The previous prime is 42550399. The next prime is 42550421. The reversal of 42550405 is 50405524.

It is a cyclic number.

It is not a de Polignac number, because 42550405 - 2¹¹ = 42548357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42550405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11559 + ... + 14788.

It is an arithmetic number, because the mean of its divisors is an integer number (3556980).

Almost surely, 2^42550405 is an apocalyptic number.

It is an amenable number.

42550405 is a deficient number, since it is larger than the sum of its proper divisors (14361275).

42550405 is a wasteful number, since it uses less digits than its factorization.

42550405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26388.

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 42550405 is about 6523.0671466726. The cubic root of 42550405 is about 349.1145099238.

Adding to 42550405 its reverse (50405524), we get a palindrome (92955929).

It can be divided in two parts, 4 and 2550405, that added together give a square (2550409 = 1597²).

The spelling of 42550405 in words is "forty-two million, five hundred fifty thousand, four hundred five".