405643634 has 16 divisors (see below), whose sum is σ = 669987936. Its totient is φ = 182659200.

The previous prime is 405643633. The next prime is 405643643. The reversal of 405643634 is 436346504.

It is a junction number, because it is equal to n+sod(n) for n = 405643594 and 405643603.

It is not an unprimeable number, because it can be changed into a prime (405643631) 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 7 ways as a sum of consecutive naturals, for example, 83807 + ... + 88514.

It is an arithmetic number, because the mean of its divisors is an integer number (41874246).

Almost surely, 2^405643634 is an apocalyptic number.

405643634 is a deficient number, since it is larger than the sum of its proper divisors (264344302).

405643634 is a wasteful number, since it uses less digits than its factorization.

405643634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172441.

The product of its (nonzero) digits is 103680, while the sum is 35.

The square root of 405643634 is about 20140.5966644486. The cubic root of 405643634 is about 740.2553501529.

The spelling of 405643634 in words is "four hundred five million, six hundred forty-three thousand, six hundred thirty-four".