42869389 has 2 divisors, whose sum is σ = 42869390. Its totient is φ = 42869388.

The previous prime is 42869371. The next prime is 42869423. The reversal of 42869389 is 98396824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42575625 + 293764 = 6525^2 + 542^2 .

It is a cyclic number.

It is not a de Polignac number, because 42869389 - 2⁷ = 42869261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42869329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21434694 + 21434695.

It is an arithmetic number, because the mean of its divisors is an integer number (21434695).

Almost surely, 2^42869389 is an apocalyptic number.

It is an amenable number.

42869389 is a deficient number, since it is larger than the sum of its proper divisors (1).

42869389 is an equidigital number, since it uses as much as digits as its factorization.

42869389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 49.

The square root of 42869389 is about 6547.4719548846. The cubic root of 42869389 is about 349.9847313067.

The spelling of 42869389 in words is "forty-two million, eight hundred sixty-nine thousand, three hundred eighty-nine".