42417779 has 4 divisors (see below), whose sum is σ = 42434784. Its totient is φ = 42400776.

The previous prime is 42417763. The next prime is 42417787. The reversal of 42417779 is 97771424.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42417779 - 2⁴ = 42417763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42417679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3947 + ... + 10020.

It is an arithmetic number, because the mean of its divisors is an integer number (10608696).

Almost surely, 2^42417779 is an apocalyptic number.

42417779 is a deficient number, since it is larger than the sum of its proper divisors (17005).

42417779 is a wasteful number, since it uses less digits than its factorization.

42417779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17004.

The product of its digits is 98784, while the sum is 41.

The square root of 42417779 is about 6512.8932894682. The cubic root of 42417779 is about 348.7514123177.

The spelling of 42417779 in words is "forty-two million, four hundred seventeen thousand, seven hundred seventy-nine".