406640447 has 4 divisors (see below), whose sum is σ = 406680936. Its totient is φ = 406599960.

The previous prime is 406640417. The next prime is 406640453. The reversal of 406640447 is 744046604.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 406640447 - 2¹⁶ = 406574911 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 (406640417) 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, 7448 + ... + 29474.

It is an arithmetic number, because the mean of its divisors is an integer number (101670234).

Almost surely, 2^406640447 is an apocalyptic number.

406640447 is a deficient number, since it is larger than the sum of its proper divisors (40489).

406640447 is a wasteful number, since it uses less digits than its factorization.

406640447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40488.

The product of its (nonzero) digits is 64512, while the sum is 35.

The square root of 406640447 is about 20165.3278426114. The cubic root of 406640447 is about 740.8612124521.

The spelling of 406640447 in words is "four hundred six million, six hundred forty thousand, four hundred forty-seven".