42396779 has 2 divisors, whose sum is σ = 42396780. Its totient is φ = 42396778.

The previous prime is 42396763. The next prime is 42396799. The reversal of 42396779 is 97769324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42396779 - 2⁴ = 42396763 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (42396799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21198389 + 21198390.

It is an arithmetic number, because the mean of its divisors is an integer number (21198390).

Almost surely, 2^42396779 is an apocalyptic number.

42396779 is a deficient number, since it is larger than the sum of its proper divisors (1).

42396779 is an equidigital number, since it uses as much as digits as its factorization.

42396779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 47.

The square root of 42396779 is about 6511.2809031710. The cubic root of 42396779 is about 348.6938500661.

The spelling of 42396779 in words is "forty-two million, three hundred ninety-six thousand, seven hundred seventy-nine".