405466621 has 12 divisors (see below), whose sum is σ = 476341020. Its totient is φ = 344097600.

The previous prime is 405466619. The next prime is 405466657. The reversal of 405466621 is 126664504.

It can be written as a sum of positive squares in 2 ways, for example, as 259660996 + 145805625 = 16114^2 + 12075^2 .

It is not a de Polignac number, because 405466621 - 2¹ = 405466619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405466021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36016 + ... + 45913.

It is an arithmetic number, because the mean of its divisors is an integer number (39695085).

Almost surely, 2^405466621 is an apocalyptic number.

It is an amenable number.

405466621 is a deficient number, since it is larger than the sum of its proper divisors (70874399).

405466621 is a wasteful number, since it uses less digits than its factorization.

405466621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82044 (or 82037 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 405466621 is about 20136.2017520683. The cubic root of 405466621 is about 740.1476580195.

The spelling of 405466621 in words is "four hundred five million, four hundred sixty-six thousand, six hundred twenty-one".