405621461 has 12 divisors (see below), whose sum is σ = 473131692. Its totient is φ = 346727808.

The previous prime is 405621449. The next prime is 405621497. The reversal of 405621461 is 164126504.

It can be written as a sum of positive squares in 2 ways, for example, as 317374225 + 88247236 = 17815^2 + 9394^2 .

It is not a de Polignac number, because 405621461 - 2⁶ = 405621397 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 (405621961) 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, 7181 + ... + 29373.

It is an arithmetic number, because the mean of its divisors is an integer number (39427641).

Almost surely, 2^405621461 is an apocalyptic number.

It is an amenable number.

405621461 is a deficient number, since it is larger than the sum of its proper divisors (67510231).

405621461 is a wasteful number, since it uses less digits than its factorization.

405621461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22580 (or 22573 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 405621461 is about 20140.0462015359. The cubic root of 405621461 is about 740.2418621389.

Adding to 405621461 its reverse (164126504), we get a palindrome (569747965).

The spelling of 405621461 in words is "four hundred five million, six hundred twenty-one thousand, four hundred sixty-one".