42219949 has 2 divisors, whose sum is σ = 42219950. Its totient is φ = 42219948.

The previous prime is 42219917. The next prime is 42219967. The reversal of 42219949 is 94991224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29920900 + 12299049 = 5470^2 + 3507^2 .

It is a cyclic number.

It is not a de Polignac number, because 42219949 - 2⁵ = 42219917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42219979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21109974 + 21109975.

It is an arithmetic number, because the mean of its divisors is an integer number (21109975).

Almost surely, 2^42219949 is an apocalyptic number.

It is an amenable number.

42219949 is a deficient number, since it is larger than the sum of its proper divisors (1).

42219949 is an equidigital number, since it uses as much as digits as its factorization.

42219949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 42219949 is about 6497.6879734256. The cubic root of 42219949 is about 348.2083929309.

The spelling of 42219949 in words is "forty-two million, two hundred nineteen thousand, nine hundred forty-nine".