42706225 has 9 divisors (see below), whose sum is σ = 52996267. Its totient is φ = 34138840.

The previous prime is 42706219. The next prime is 42706249. The reversal of 42706225 is 52260724.

The square root of 42706225 is 6535.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 15374241 + 27331984 = 3921^2 + 5228^2 .

It is not a de Polignac number, because 42706225 - 2⁹ = 42705713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42706193 and 42706202.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 32022 + ... + 33328.

Almost surely, 2^42706225 is an apocalyptic number.

42706225 is the 6535-th square number.

42706225 is the 3268-th centered octagonal number.

It is an amenable number.

42706225 is a deficient number, since it is larger than the sum of its proper divisors (10290042).

42706225 is an frugal number, since it uses more digits than its factorization.

42706225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624 (or 1312 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The cubic root of 42706225 is about 349.5401443719.

Adding to 42706225 its reverse (52260724), we get a palindrome (94966949).

The spelling of 42706225 in words is "forty-two million, seven hundred six thousand, two hundred twenty-five".