42697979 has 2 divisors, whose sum is σ = 42697980. Its totient is φ = 42697978.

The previous prime is 42697973. The next prime is 42698021. The reversal of 42697979 is 97979624.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42697979 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42697979.

It is not a weakly prime, because it can be changed into another prime (42697973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21348989 + 21348990.

It is an arithmetic number, because the mean of its divisors is an integer number (21348990).

Almost surely, 2^42697979 is an apocalyptic number.

42697979 is a deficient number, since it is larger than the sum of its proper divisors (1).

42697979 is an equidigital number, since it uses as much as digits as its factorization.

42697979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 53.

The square root of 42697979 is about 6534.3690590599. The cubic root of 42697979 is about 349.5176457505.

The spelling of 42697979 in words is "forty-two million, six hundred ninety-seven thousand, nine hundred seventy-nine".