42280405 has 16 divisors (see below), whose sum is σ = 53164800. Its totient is φ = 32235840.

The previous prime is 42280393. The next prime is 42280409. The reversal of 42280405 is 50408224.

It is a happy number.

It is not a de Polignac number, because 42280405 - 2¹³ = 42272213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42280405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42280409) 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, 9610 + ... + 13300.

It is an arithmetic number, because the mean of its divisors is an integer number (3322800).

Almost surely, 2^42280405 is an apocalyptic number.

It is an amenable number.

42280405 is a deficient number, since it is larger than the sum of its proper divisors (10884395).

42280405 is a wasteful number, since it uses less digits than its factorization.

42280405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3804.

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 42280405 is about 6502.3384255205. The cubic root of 42280405 is about 348.3745169797.

Adding to 42280405 its reverse (50408224), we get a palindrome (92688629).

The spelling of 42280405 in words is "forty-two million, two hundred eighty thousand, four hundred five".