406210621 has 4 divisors (see below), whose sum is σ = 406429372. Its totient is φ = 405991872.

The previous prime is 406210589. The next prime is 406210711. The reversal of 406210621 is 126012604.

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 178623225 + 227587396 = 13365^2 + 15086^2 .

It is a cyclic number.

It is not a de Polignac number, because 406210621 - 2⁵ = 406210589 is a prime.

It is a super-2 number, since 2×406210621² = 330014137226411282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 406210592 and 406210601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406210421) 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, 106566 + ... + 110311.

It is an arithmetic number, because the mean of its divisors is an integer number (101607343).

Almost surely, 2^406210621 is an apocalyptic number.

It is an amenable number.

406210621 is a deficient number, since it is larger than the sum of its proper divisors (218751).

406210621 is a wasteful number, since it uses less digits than its factorization.

406210621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218750.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 406210621 is about 20154.6674743098. The cubic root of 406210621 is about 740.6000860450.

The spelling of 406210621 in words is "four hundred six million, two hundred ten thousand, six hundred twenty-one".