42400055 has 8 divisors (see below), whose sum is σ = 51742800. Its totient is φ = 33344896.

The previous prime is 42400009. The next prime is 42400067. The reversal of 42400055 is 55000424.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 42400055 - 2¹² = 42395959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71570 + ... + 72159.

It is an arithmetic number, because the mean of its divisors is an integer number (6467850).

Almost surely, 2^42400055 is an apocalyptic number.

42400055 is a deficient number, since it is larger than the sum of its proper divisors (9342745).

42400055 is a wasteful number, since it uses less digits than its factorization.

42400055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143793.

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 42400055 is about 6511.5324617174. The cubic root of 42400055 is about 348.7028310285.

Adding to 42400055 its reverse (55000424), we get a palindrome (97400479).

The spelling of 42400055 in words is "forty-two million, four hundred thousand, fifty-five".