409720671 has 12 divisors (see below), whose sum is σ = 612226680. Its totient is φ = 263728080.

The previous prime is 409720631. The next prime is 409720679. The reversal of 409720671 is 176027904.

It is a happy number.

It is not a de Polignac number, because 409720671 - 2⁶ = 409720607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409720679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 784645 + ... + 785166.

It is an arithmetic number, because the mean of its divisors is an integer number (51018890).

Almost surely, 2^409720671 is an apocalyptic number.

409720671 is a deficient number, since it is larger than the sum of its proper divisors (202506009).

409720671 is a wasteful number, since it uses less digits than its factorization.

409720671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1569846 (or 1569843 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 409720671 is about 20241.5580180973. The cubic root of 409720671 is about 742.7271365775.

The spelling of 409720671 in words is "four hundred nine million, seven hundred twenty thousand, six hundred seventy-one".