405634 has 4 divisors (see below), whose sum is σ = 608454. Its totient is φ = 202816.

The previous prime is 405611. The next prime is 405641. The reversal of 405634 is 436504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 363609 + 42025 = 603^2 + 205^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101407 + ... + 101410.

2⁴⁰⁵⁶³⁴ is an apocalyptic number.

405634 is a deficient number, since it is larger than the sum of its proper divisors (202820).

405634 is a wasteful number, since it uses less digits than its factorization.

405634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202819.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 405634 is about 636.8940257217. The cubic root of 405634 is about 74.0249489774.

The spelling of 405634 in words is "four hundred five thousand, six hundred thirty-four".