42215977 has 2 divisors, whose sum is σ = 42215978. Its totient is φ = 42215976.

The previous prime is 42215969. The next prime is 42215989. The reversal of 42215977 is 77951224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41422096 + 793881 = 6436^2 + 891^2 .

It is a cyclic number.

It is not a de Polignac number, because 42215977 - 2³ = 42215969 is a prime.

It is not a weakly prime, because it can be changed into another prime (42215177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21107988 + 21107989.

It is an arithmetic number, because the mean of its divisors is an integer number (21107989).

Almost surely, 2^42215977 is an apocalyptic number.

It is an amenable number.

42215977 is a deficient number, since it is larger than the sum of its proper divisors (1).

42215977 is an equidigital number, since it uses as much as digits as its factorization.

42215977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 37.

The square root of 42215977 is about 6497.3823190574. The cubic root of 42215977 is about 348.1974729184.

The spelling of 42215977 in words is "forty-two million, two hundred fifteen thousand, nine hundred seventy-seven".