42217642 has 4 divisors (see below), whose sum is σ = 63326466. Its totient is φ = 21108820.

The previous prime is 42217633. The next prime is 42217661. The reversal of 42217642 is 24671224.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 35295481 + 6922161 = 5941^2 + 2631^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 42217642.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10554409 + ... + 10554412.

Almost surely, 2^42217642 is an apocalyptic number.

42217642 is a deficient number, since it is larger than the sum of its proper divisors (21108824).

42217642 is a wasteful number, since it uses less digits than its factorization.

42217642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21108823.

The product of its digits is 5376, while the sum is 28.

The square root of 42217642 is about 6497.5104463171. The cubic root of 42217642 is about 348.2020504995.

Adding to 42217642 its reverse (24671224), we get a palindrome (66888866).

The spelling of 42217642 in words is "forty-two million, two hundred seventeen thousand, six hundred forty-two".