42388117 has 2 divisors, whose sum is σ = 42388118. Its totient is φ = 42388116.

The previous prime is 42388109. The next prime is 42388217. The reversal of 42388117 is 71188324.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36108081 + 6280036 = 6009^2 + 2506^2 .

It is a cyclic number.

It is not a de Polignac number, because 42388117 - 2³ = 42388109 is a prime.

It is equal to p_2569831 and since 42388117 and 2569831 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42388217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21194058 + 21194059.

It is an arithmetic number, because the mean of its divisors is an integer number (21194059).

Almost surely, 2^42388117 is an apocalyptic number.

It is an amenable number.

42388117 is a deficient number, since it is larger than the sum of its proper divisors (1).

42388117 is an equidigital number, since it uses as much as digits as its factorization.

42388117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 34.

The square root of 42388117 is about 6510.6157158905. The cubic root of 42388117 is about 348.6701014707.

The spelling of 42388117 in words is "forty-two million, three hundred eighty-eight thousand, one hundred seventeen".