42720212 has 6 divisors (see below), whose sum is σ = 74760378. Its totient is φ = 21360104.

The previous prime is 42720193. The next prime is 42720217. The reversal of 42720212 is 21202724.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 29441476 + 13278736 = 5426^2 + 3644^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42720217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5340023 + ... + 5340030.

It is an arithmetic number, because the mean of its divisors is an integer number (12460063).

Almost surely, 2^42720212 is an apocalyptic number.

It is an amenable number.

42720212 is a deficient number, since it is larger than the sum of its proper divisors (32040166).

42720212 is a wasteful number, since it uses less digits than its factorization.

42720212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10680057 (or 10680055 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 42720212 is about 6536.0700730638. The cubic root of 42720212 is about 349.5783002797.

Adding to 42720212 its reverse (21202724), we get a palindrome (63922936).

The spelling of 42720212 in words is "forty-two million, seven hundred twenty thousand, two hundred twelve".