405661451 has 8 divisors (see below), whose sum is σ = 448673904. Its totient is φ = 364335840.

The previous prime is 405661433. The next prime is 405661471. The reversal of 405661451 is 154166504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 405661451 - 2¹⁴ = 405645067 is a prime.

It is a super-2 number, since 2×405661451² = 329122425654850802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405661471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421205 + ... + 422166.

It is an arithmetic number, because the mean of its divisors is an integer number (56084238).

Almost surely, 2^405661451 is an apocalyptic number.

405661451 is a deficient number, since it is larger than the sum of its proper divisors (43012453).

405661451 is a wasteful number, since it uses less digits than its factorization.

405661451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843421.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 405661451 is about 20141.0389751870. The cubic root of 405661451 is about 740.2661880209.

The spelling of 405661451 in words is "four hundred five million, six hundred sixty-one thousand, four hundred fifty-one".