40620409 has 2 divisors, whose sum is σ = 40620410. Its totient is φ = 40620408.

The previous prime is 40620407. The next prime is 40620421. The reversal of 40620409 is 90402604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39187600 + 1432809 = 6260^2 + 1197^2 .

It is a cyclic number.

It is not a de Polignac number, because 40620409 - 2¹ = 40620407 is a prime.

Together with 40620407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40620407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20310204 + 20310205.

It is an arithmetic number, because the mean of its divisors is an integer number (20310205).

Almost surely, 2^40620409 is an apocalyptic number.

It is an amenable number.

40620409 is a deficient number, since it is larger than the sum of its proper divisors (1).

40620409 is an equidigital number, since it uses as much as digits as its factorization.

40620409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 40620409 is about 6373.4142341448. The cubic root of 40620409 is about 343.7542666578.

The spelling of 40620409 in words is "forty million, six hundred twenty thousand, four hundred nine".