409023947 has 4 divisors (see below), whose sum is σ = 412244736. Its totient is φ = 405803160.

The previous prime is 409023941. The next prime is 409023959. The reversal of 409023947 is 749320904.

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 409023947 - 2¹⁶ = 408958411 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 409023947.

It is not an unprimeable number, because it can be changed into a prime (409023941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1610204 + ... + 1610457.

It is an arithmetic number, because the mean of its divisors is an integer number (103061184).

Almost surely, 2^409023947 is an apocalyptic number.

409023947 is a deficient number, since it is larger than the sum of its proper divisors (3220789).

409023947 is a wasteful number, since it uses less digits than its factorization.

409023947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220788.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 409023947 is about 20224.3404589618. The cubic root of 409023947 is about 742.3058988452.

The spelling of 409023947 in words is "four hundred nine million, twenty-three thousand, nine hundred forty-seven".