409220647 has 4 divisors (see below), whose sum is σ = 446422536. Its totient is φ = 372018760.

The previous prime is 409220633. The next prime is 409220731. The reversal of 409220647 is 746022904.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 409220647 - 2¹⁹ = 408696359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409280647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18600928 + ... + 18600949.

It is an arithmetic number, because the mean of its divisors is an integer number (111605634).

Almost surely, 2^409220647 is an apocalyptic number.

409220647 is a deficient number, since it is larger than the sum of its proper divisors (37201889).

409220647 is a wasteful number, since it uses less digits than its factorization.

409220647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37201888.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 409220647 is about 20229.2028266069. The cubic root of 409220647 is about 742.4248716437.

The spelling of 409220647 in words is "four hundred nine million, two hundred twenty thousand, six hundred forty-seven".