42679657 has 2 divisors, whose sum is σ = 42679658. Its totient is φ = 42679656.

The previous prime is 42679631. The next prime is 42679661. The reversal of 42679657 is 75697624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32592681 + 10086976 = 5709^2 + 3176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42679657 is a prime.

It is not a weakly prime, because it can be changed into another prime (42679627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21339828 + 21339829.

It is an arithmetic number, because the mean of its divisors is an integer number (21339829).

Almost surely, 2^42679657 is an apocalyptic number.

It is an amenable number.

42679657 is a deficient number, since it is larger than the sum of its proper divisors (1).

42679657 is an equidigital number, since it uses as much as digits as its factorization.

42679657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 46.

The square root of 42679657 is about 6532.9669370050. The cubic root of 42679657 is about 349.4676451131.

It can be divided in two parts, 4267 and 9657, that added together give a square (13924 = 118²).

The spelling of 42679657 in words is "forty-two million, six hundred seventy-nine thousand, six hundred fifty-seven".