42730117 has 2 divisors, whose sum is σ = 42730118. Its totient is φ = 42730116.

The previous prime is 42730109. The next prime is 42730133. The reversal of 42730117 is 71103724.

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., 40883236 + 1846881 = 6394^2 + 1359^2 .

It is a cyclic number.

It is not a de Polignac number, because 42730117 - 2³ = 42730109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42730091 and 42730100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42730147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21365058 + 21365059.

It is an arithmetic number, because the mean of its divisors is an integer number (21365059).

Almost surely, 2^42730117 is an apocalyptic number.

It is an amenable number.

42730117 is a deficient number, since it is larger than the sum of its proper divisors (1).

42730117 is an equidigital number, since it uses as much as digits as its factorization.

42730117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 42730117 is about 6536.8277474628. The cubic root of 42730117 is about 349.6053156380.

The spelling of 42730117 in words is "forty-two million, seven hundred thirty thousand, one hundred seventeen".