43720225 has 12 divisors (see below), whose sum is σ = 55103740. Its totient is φ = 34401600.

The previous prime is 43720223. The next prime is 43720231. The reversal of 43720225 is 52202734.

It can be written as a sum of positive squares in 6 ways, for example, as 3283344 + 40436881 = 1812^2 + 6359^2 .

It is not a de Polignac number, because 43720225 - 2¹ = 43720223 is a prime.

It is a super-2 number, since 2×43720225² = 3822916148101250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 43720225.

It is not an unprimeable number, because it can be changed into a prime (43720223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12810 + ... + 15859.

Almost surely, 2^43720225 is an apocalyptic number.

It is an amenable number.

43720225 is a deficient number, since it is larger than the sum of its proper divisors (11383515).

43720225 is a wasteful number, since it uses less digits than its factorization.

43720225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28740 (or 28735 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 43720225 is about 6612.1271161405. The cubic root of 43720225 is about 352.2849819595.

Adding to 43720225 its reverse (52202734), we get a palindrome (95922959).

The spelling of 43720225 in words is "forty-three million, seven hundred twenty thousand, two hundred twenty-five".