40420409 has 4 divisors (see below), whose sum is σ = 40459920. Its totient is φ = 40380900.

The previous prime is 40420381. The next prime is 40420411. The reversal of 40420409 is 90402404.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40420409 - 2²⁰ = 39371833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40422409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18179 + ... + 20280.

It is an arithmetic number, because the mean of its divisors is an integer number (10114980).

Almost surely, 2^40420409 is an apocalyptic number.

It is an amenable number.

40420409 is a deficient number, since it is larger than the sum of its proper divisors (39511).

40420409 is a wasteful number, since it uses less digits than its factorization.

40420409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39510.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 40420409 is about 6357.7046958789. The cubic root of 40420409 is about 343.1891648666.

The spelling of 40420409 in words is "forty million, four hundred twenty thousand, four hundred nine".