40720225 has 36 divisors (see below), whose sum is σ = 63279804. Its totient is φ = 25764480.

The previous prime is 40720223. The next prime is 40720231. The reversal of 40720225 is 52202704.

It can be written as a sum of positive squares in 6 ways, for example, as 5400976 + 35319249 = 2324^2 + 5943^2 .

It is not a de Polignac number, because 40720225 - 2¹ = 40720223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40720196 and 40720205.

It is not an unprimeable number, because it can be changed into a prime (40720223) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14647 + ... + 17203.

Almost surely, 2^40720225 is an apocalyptic number.

It is an amenable number.

40720225 is a deficient number, since it is larger than the sum of its proper divisors (22559579).

40720225 is a wasteful number, since it uses less digits than its factorization.

40720225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594 (or 2582 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 40720225 is about 6381.2400832440. The cubic root of 40720225 is about 344.0356039631.

Adding to 40720225 its reverse (52202704), we get a palindrome (92922929).

The spelling of 40720225 in words is "forty million, seven hundred twenty thousand, two hundred twenty-five".