406860721 has 4 divisors (see below), whose sum is σ = 406907712. Its totient is φ = 406813732.

The previous prime is 406860697. The next prime is 406860733. The reversal of 406860721 is 127068604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, 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 406860721 - 2⁵ = 406860689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406860761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6325 + ... + 29218.

It is an arithmetic number, because the mean of its divisors is an integer number (101726928).

Almost surely, 2^406860721 is an apocalyptic number.

It is an amenable number.

406860721 is a deficient number, since it is larger than the sum of its proper divisors (46991).

406860721 is a wasteful number, since it uses less digits than its factorization.

406860721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46990.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 406860721 is about 20170.7888046055. The cubic root of 406860721 is about 740.9949612435.

The spelling of 406860721 in words is "four hundred six million, eight hundred sixty thousand, seven hundred twenty-one".