42400405 has 8 divisors (see below), whose sum is σ = 52521984. Its totient is φ = 32826000.

The previous prime is 42400403. The next prime is 42400411. The reversal of 42400405 is 50400424.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42400405 - 2¹ = 42400403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42400403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136621 + ... + 136930.

It is an arithmetic number, because the mean of its divisors is an integer number (6565248).

Almost surely, 2^42400405 is an apocalyptic number.

It is an amenable number.

42400405 is a deficient number, since it is larger than the sum of its proper divisors (10121579).

42400405 is a wasteful number, since it uses less digits than its factorization.

42400405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273587.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 42400405 is about 6511.5593370559. The cubic root of 42400405 is about 348.7037905057.

Adding to 42400405 its sum of digits (19), we get a palindrome (42400424).

Adding to 42400405 its reverse (50400424), we get a palindrome (92800829).

The spelling of 42400405 in words is "forty-two million, four hundred thousand, four hundred five".