406513421 has 4 divisors (see below), whose sum is σ = 412082172. Its totient is φ = 400944672.

The previous prime is 406513403. The next prime is 406513441. The reversal of 406513421 is 124315604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81252196 + 325261225 = 9014^2 + 18035^2 .

It is a cyclic number.

It is not a de Polignac number, because 406513421 - 2¹⁰ = 406512397 is a prime.

It is a super-2 number, since 2×406513421² = 330506322906246482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406513441) 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, 2784266 + ... + 2784411.

It is an arithmetic number, because the mean of its divisors is an integer number (103020543).

Almost surely, 2^406513421 is an apocalyptic number.

It is an amenable number.

406513421 is a deficient number, since it is larger than the sum of its proper divisors (5568751).

406513421 is an equidigital number, since it uses as much as digits as its factorization.

406513421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5568750.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 406513421 is about 20162.1779825494. The cubic root of 406513421 is about 740.7840612178.

The spelling of 406513421 in words is "four hundred six million, five hundred thirteen thousand, four hundred twenty-one".