42320405 has 16 divisors (see below), whose sum is σ = 52920000. Its totient is φ = 32461440.

The previous prime is 42320401. The next prime is 42320419. The reversal of 42320405 is 50402324.

It is not a de Polignac number, because 42320405 - 2² = 42320401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42320401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10346 + ... + 13844.

It is an arithmetic number, because the mean of its divisors is an integer number (3307500).

Almost surely, 2^42320405 is an apocalyptic number.

It is an amenable number.

42320405 is a deficient number, since it is larger than the sum of its proper divisors (10599595).

42320405 is a wasteful number, since it uses less digits than its factorization.

42320405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3604.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 42320405 is about 6505.4135149120. The cubic root of 42320405 is about 348.4843439671.

Adding to 42320405 its reverse (50402324), we get a palindrome (92722729).

It can be divided in two parts, 42320 and 405, that multiplied together give a square (17139600 = 4140²).

The spelling of 42320405 in words is "forty-two million, three hundred twenty thousand, four hundred five".