406710921 has 4 divisors (see below), whose sum is σ = 542281232. Its totient is φ = 271140612.

The previous prime is 406710901. The next prime is 406710929. The reversal of 406710921 is 129017604.

It is a happy number.

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 not a de Polignac number, because 406710921 - 2¹⁴ = 406694537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406710929) 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, 67785151 + ... + 67785156.

It is an arithmetic number, because the mean of its divisors is an integer number (135570308).

Almost surely, 2^406710921 is an apocalyptic number.

It is an amenable number.

406710921 is a deficient number, since it is larger than the sum of its proper divisors (135570311).

406710921 is a wasteful number, since it uses less digits than its factorization.

406710921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135570310.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 406710921 is about 20167.0751721711. The cubic root of 406710921 is about 740.9040090124.

The spelling of 406710921 in words is "four hundred six million, seven hundred ten thousand, nine hundred twenty-one".