42989693 has 2 divisors, whose sum is σ = 42989694. Its totient is φ = 42989692.

The previous prime is 42989677. The next prime is 42989699. The reversal of 42989693 is 39698924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22676644 + 20313049 = 4762^2 + 4507^2 .

It is a cyclic number.

It is not a de Polignac number, because 42989693 - 2⁴ = 42989677 is a prime.

It is a super-2 number, since 2×42989693² = 3696227408468498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42989699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21494846 + 21494847.

It is an arithmetic number, because the mean of its divisors is an integer number (21494847).

Almost surely, 2^42989693 is an apocalyptic number.

It is an amenable number.

42989693 is a deficient number, since it is larger than the sum of its proper divisors (1).

42989693 is an equidigital number, since it uses as much as digits as its factorization.

42989693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 50.

The square root of 42989693 is about 6556.6525758195. The cubic root of 42989693 is about 350.3118119229.

The spelling of 42989693 in words is "forty-two million, nine hundred eighty-nine thousand, six hundred ninety-three".