42209389 has 2 divisors, whose sum is σ = 42209390. Its totient is φ = 42209388.

The previous prime is 42209371. The next prime is 42209441. The reversal of 42209389 is 98390224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40106889 + 2102500 = 6333^2 + 1450^2 .

It is a cyclic number.

It is not a de Polignac number, because 42209389 - 2⁵ = 42209357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42209309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21104694 + 21104695.

It is an arithmetic number, because the mean of its divisors is an integer number (21104695).

Almost surely, 2^42209389 is an apocalyptic number.

It is an amenable number.

42209389 is a deficient number, since it is larger than the sum of its proper divisors (1).

42209389 is an equidigital number, since it uses as much as digits as its factorization.

42209389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 42209389 is about 6496.8753258778. The cubic root of 42209389 is about 348.1793593632.

The spelling of 42209389 in words is "forty-two million, two hundred nine thousand, three hundred eighty-nine".