42618637 has 2 divisors, whose sum is σ = 42618638. Its totient is φ = 42618636.

The previous prime is 42618601. The next prime is 42618649. The reversal of 42618637 is 73681624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26770276 + 15848361 = 5174^2 + 3981^2 .

It is a cyclic number.

It is not a de Polignac number, because 42618637 - 2⁷ = 42618509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42618596 and 42618605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42618937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21309318 + 21309319.

It is an arithmetic number, because the mean of its divisors is an integer number (21309319).

Almost surely, 2^42618637 is an apocalyptic number.

It is an amenable number.

42618637 is a deficient number, since it is larger than the sum of its proper divisors (1).

42618637 is an equidigital number, since it uses as much as digits as its factorization.

42618637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 37.

The square root of 42618637 is about 6528.2951066875. The cubic root of 42618637 is about 349.3010186062.

The spelling of 42618637 in words is "forty-two million, six hundred eighteen thousand, six hundred thirty-seven".