406717921 has 4 divisors (see below), whose sum is σ = 407851200. Its totient is φ = 405584644.

The previous prime is 406717907. The next prime is 406717957. The reversal of 406717921 is 129717604.

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.

It is a cyclic number.

It is not a de Polignac number, because 406717921 - 2⁵ = 406717889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406717121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 566101 + ... + 566818.

It is an arithmetic number, because the mean of its divisors is an integer number (101962800).

Almost surely, 2^406717921 is an apocalyptic number.

It is an amenable number.

406717921 is a deficient number, since it is larger than the sum of its proper divisors (1133279).

406717921 is a wasteful number, since it uses less digits than its factorization.

406717921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133278.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 406717921 is about 20167.2487216278. The cubic root of 406717921 is about 740.9082596140.

The spelling of 406717921 in words is "four hundred six million, seven hundred seventeen thousand, nine hundred twenty-one".