42400079 has 8 divisors (see below), whose sum is σ = 43627440. Its totient is φ = 41190336.

The previous prime is 42400069. The next prime is 42400081. The reversal of 42400079 is 97000424.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42400079 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 (42400009) 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, 557 + ... + 9225.

It is an arithmetic number, because the mean of its divisors is an integer number (5453430).

Almost surely, 2^42400079 is an apocalyptic number.

42400079 is a deficient number, since it is larger than the sum of its proper divisors (1227361).

42400079 is an equidigital number, since it uses as much as digits as its factorization.

42400079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8809.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 42400079 is about 6511.5343046013. The cubic root of 42400079 is about 348.7028968214.

The spelling of 42400079 in words is "forty-two million, four hundred thousand, seventy-nine".