405644431 has 16 divisors (see below), whose sum is σ = 432944640. Its totient is φ = 379330560.

The previous prime is 405644401. The next prime is 405644443. The reversal of 405644431 is 134446504.

It is a cyclic number.

It is not a de Polignac number, because 405644431 - 2⁷ = 405644303 is a prime.

It is a super-2 number, since 2×405644431² = 329094808802627522, 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 = 405644393 and 405644402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405644401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275026 + ... + 276496.

It is an arithmetic number, because the mean of its divisors is an integer number (27059040).

Almost surely, 2^405644431 is an apocalyptic number.

405644431 is a deficient number, since it is larger than the sum of its proper divisors (27300209).

405644431 is a wasteful number, since it uses less digits than its factorization.

405644431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794.

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 405644431 is about 20140.6164503473. The cubic root of 405644431 is about 740.2558349652.

The spelling of 405644431 in words is "four hundred five million, six hundred forty-four thousand, four hundred thirty-one".