405946 has 4 divisors (see below), whose sum is σ = 608922. Its totient is φ = 202972.

The previous prime is 405917. The next prime is 405947. The reversal of 405946 is 649504.

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., 275625 + 130321 = 525^2 + 361^2 .

It is not an unprimeable number, because it can be changed into a prime (405947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101485 + ... + 101488.

2⁴⁰⁵⁹⁴⁶ is an apocalyptic number.

405946 is a deficient number, since it is larger than the sum of its proper divisors (202976).

405946 is a wasteful number, since it uses less digits than its factorization.

405946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202975.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 405946 is about 637.1389173485. The cubic root of 405946 is about 74.0439232786.

The spelling of 405946 in words is "four hundred five thousand, nine hundred forty-six".