42815387 has 2 divisors, whose sum is σ = 42815388. Its totient is φ = 42815386.

The previous prime is 42815359. The next prime is 42815407. The reversal of 42815387 is 78351824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42815387 - 2²² = 38621083 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42815387.

It is not a weakly prime, because it can be changed into another prime (42815317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21407693 + 21407694.

It is an arithmetic number, because the mean of its divisors is an integer number (21407694).

Almost surely, 2^42815387 is an apocalyptic number.

42815387 is a deficient number, since it is larger than the sum of its proper divisors (1).

42815387 is an equidigital number, since it uses as much as digits as its factorization.

42815387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 38.

The square root of 42815387 is about 6543.3467736320. The cubic root of 42815387 is about 349.8377125175.

The spelling of 42815387 in words is "forty-two million, eight hundred fifteen thousand, three hundred eighty-seven".