42388649 has 2 divisors, whose sum is σ = 42388650. Its totient is φ = 42388648.

The previous prime is 42388637. The next prime is 42388679. The reversal of 42388649 is 94688324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27489049 + 14899600 = 5243^2 + 3860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42388649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42388679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21194324 + 21194325.

It is an arithmetic number, because the mean of its divisors is an integer number (21194325).

Almost surely, 2^42388649 is an apocalyptic number.

It is an amenable number.

42388649 is a deficient number, since it is larger than the sum of its proper divisors (1).

42388649 is an equidigital number, since it uses as much as digits as its factorization.

42388649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 44.

The square root of 42388649 is about 6510.6565721131. The cubic root of 42388649 is about 348.6715601478.

The spelling of 42388649 in words is "forty-two million, three hundred eighty-eight thousand, six hundred forty-nine".