40512209 has 2 divisors, whose sum is σ = 40512210. Its totient is φ = 40512208.

The previous prime is 40512203. The next prime is 40512229. The reversal of 40512209 is 90221504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28121809 + 12390400 = 5303^2 + 3520^2 .

It is a cyclic number.

It is not a de Polignac number, because 40512209 - 2¹² = 40508113 is a prime.

It is a super-3 number, since 3×40512209³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (40512203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20256104 + 20256105.

It is an arithmetic number, because the mean of its divisors is an integer number (20256105).

Almost surely, 2^40512209 is an apocalyptic number.

It is an amenable number.

40512209 is a deficient number, since it is larger than the sum of its proper divisors (1).

40512209 is an equidigital number, since it uses as much as digits as its factorization.

40512209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 40512209 is about 6364.9201880306. The cubic root of 40512209 is about 343.4487774871.

The spelling of 40512209 in words is "forty million, five hundred twelve thousand, two hundred nine".