406121 has 4 divisors (see below), whose sum is σ = 410244. Its totient is φ = 402000.

The previous prime is 406117. The next prime is 406123. The reversal of 406121 is 121604.

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 212521 + 193600 = 461^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 406121 - 2² = 406117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 406096 and 406105.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 406121.

It is not an unprimeable number, because it can be changed into a prime (406123) 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, 1910 + ... + 2111.

It is an arithmetic number, because the mean of its divisors is an integer number (102561).

2⁴⁰⁶¹²¹ is an apocalyptic number.

It is an amenable number.

406121 is a deficient number, since it is larger than the sum of its proper divisors (4123).

406121 is a wasteful number, since it uses less digits than its factorization.

406121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4122.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 406121 is about 637.2762352387. The cubic root of 406121 is about 74.0545616599.

Adding to 406121 its reverse (121604), we get a palindrome (527725).

The spelling of 406121 in words is "four hundred six thousand, one hundred twenty-one".