42638653 has 2 divisors, whose sum is σ = 42638654. Its totient is φ = 42638652.

The previous prime is 42638639. The next prime is 42638663. The reversal of 42638653 is 35683624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38464804 + 4173849 = 6202^2 + 2043^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42638653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42638623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21319326 + 21319327.

It is an arithmetic number, because the mean of its divisors is an integer number (21319327).

Almost surely, 2^42638653 is an apocalyptic number.

It is an amenable number.

42638653 is a deficient number, since it is larger than the sum of its proper divisors (1).

42638653 is an equidigital number, since it uses as much as digits as its factorization.

42638653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 37.

The square root of 42638653 is about 6529.8279456659. The cubic root of 42638653 is about 349.3556935514.

The spelling of 42638653 in words is "forty-two million, six hundred thirty-eight thousand, six hundred fifty-three".