42197977 has 2 divisors, whose sum is σ = 42197978. Its totient is φ = 42197976.

The previous prime is 42197971. The next prime is 42197983. The reversal of 42197977 is 77979124.

It is a balanced prime because it is at equal distance from previous prime (42197971) and next prime (42197983).

It can be written as a sum of positive squares in only one way, i.e., 38241856 + 3956121 = 6184^2 + 1989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42197977 is a prime.

It is not a weakly prime, because it can be changed into another prime (42197971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21098988 + 21098989.

It is an arithmetic number, because the mean of its divisors is an integer number (21098989).

Almost surely, 2^42197977 is an apocalyptic number.

It is an amenable number.

42197977 is a deficient number, since it is larger than the sum of its proper divisors (1).

42197977 is an equidigital number, since it uses as much as digits as its factorization.

42197977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 222264, while the sum is 46.

The square root of 42197977 is about 6495.9969981520. The cubic root of 42197977 is about 348.1479778698.

The spelling of 42197977 in words is "forty-two million, one hundred ninety-seven thousand, nine hundred seventy-seven".