42220777 has 2 divisors, whose sum is σ = 42220778. Its totient is φ = 42220776.

The previous prime is 42220757. The next prime is 42220819. The reversal of 42220777 is 77702224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38204761 + 4016016 = 6181^2 + 2004^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42220777 is a prime.

It is not a weakly prime, because it can be changed into another prime (42220757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21110388 + 21110389.

It is an arithmetic number, because the mean of its divisors is an integer number (21110389).

Almost surely, 2^42220777 is an apocalyptic number.

It is an amenable number.

42220777 is a deficient number, since it is larger than the sum of its proper divisors (1).

42220777 is an equidigital number, since it uses as much as digits as its factorization.

42220777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10976, while the sum is 31.

The square root of 42220777 is about 6497.7516880841. The cubic root of 42220777 is about 348.2106692219.

The spelling of 42220777 in words is "forty-two million, two hundred twenty thousand, seven hundred seventy-seven".