406805247 has 20 divisors (see below), whose sum is σ = 609924216. Its totient is φ = 270209520.

The previous prime is 406805237. The next prime is 406805249. The reversal of 406805247 is 742508604.

406805247 is a `hidden beast` number, since 406 + 8 + 0 + 5 + 247 = 666.

It is not a de Polignac number, because 406805247 - 2⁶ = 406805183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406805249) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13372 + ... + 31502.

Almost surely, 2^406805247 is an apocalyptic number.

406805247 is a deficient number, since it is larger than the sum of its proper divisors (203118969).

406805247 is a wasteful number, since it uses less digits than its factorization.

406805247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18420 (or 18411 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 406805247 is about 20169.4136503767. The cubic root of 406805247 is about 740.9612823777.

The spelling of 406805247 in words is "four hundred six million, eight hundred five thousand, two hundred forty-seven".