405961 has 4 divisors (see below), whose sum is σ = 407572. Its totient is φ = 404352.

The previous prime is 405959. The next prime is 405967. The reversal of 405961 is 169504.

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

It can be written as a sum of positive squares in 2 ways, for example, as 207936 + 198025 = 456^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 405961 - 2¹ = 405959 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (405967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336 + ... + 961.

It is an arithmetic number, because the mean of its divisors is an integer number (101893).

2⁴⁰⁵⁹⁶¹ is an apocalyptic number.

It is an amenable number.

405961 is a deficient number, since it is larger than the sum of its proper divisors (1611).

405961 is a wasteful number, since it uses less digits than its factorization.

405961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 405961 is about 637.1506886130. The cubic root of 405961 is about 74.0448352596.

The spelling of 405961 in words is "four hundred five thousand, nine hundred sixty-one".