40211009 has 2 divisors, whose sum is σ = 40211010. Its totient is φ = 40211008.

The previous prime is 40210981. The next prime is 40211053. The reversal of 40211009 is 90011204.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23425600 + 16785409 = 4840^2 + 4097^2 .

It is a cyclic number.

It is not a de Polignac number, because 40211009 - 2²⁴ = 23433793 is a prime.

It is not a weakly prime, because it can be changed into another prime (40211099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20105504 + 20105505.

It is an arithmetic number, because the mean of its divisors is an integer number (20105505).

Almost surely, 2^40211009 is an apocalyptic number.

It is an amenable number.

40211009 is a deficient number, since it is larger than the sum of its proper divisors (1).

40211009 is an equidigital number, since it uses as much as digits as its factorization.

40211009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 40211009 is about 6341.2151043787. The cubic root of 40211009 is about 342.5955021653.

It can be divided in two parts, 402 and 11009, that added together give a palindrome (11411).

The spelling of 40211009 in words is "forty million, two hundred eleven thousand, nine".