42779273 has 2 divisors, whose sum is σ = 42779274. Its totient is φ = 42779272.

The previous prime is 42779251. The next prime is 42779291. The reversal of 42779273 is 37297724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38402809 + 4376464 = 6197^2 + 2092^2 .

It is a cyclic number.

It is not a de Polignac number, because 42779273 - 2⁸ = 42779017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42779273.

It is not a weakly prime, because it can be changed into another prime (42779173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21389636 + 21389637.

It is an arithmetic number, because the mean of its divisors is an integer number (21389637).

Almost surely, 2^42779273 is an apocalyptic number.

It is an amenable number.

42779273 is a deficient number, since it is larger than the sum of its proper divisors (1).

42779273 is an equidigital number, since it uses as much as digits as its factorization.

42779273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 148176, while the sum is 41.

The square root of 42779273 is about 6540.5865944883. The cubic root of 42779273 is about 349.7393242674.

The spelling of 42779273 in words is "forty-two million, seven hundred seventy-nine thousand, two hundred seventy-three".