405340121 has 4 divisors (see below), whose sum is σ = 406410000. Its totient is φ = 404270244.

The previous prime is 405340099. The next prime is 405340139. The reversal of 405340121 is 121043504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 405340121 - 2⁶ = 405340057 is a prime.

It is a super-2 number, since 2×405340121² = 328601227384589282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 405340093 and 405340102.

It is not an unprimeable number, because it can be changed into a prime (405340141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534371 + ... + 535128.

It is an arithmetic number, because the mean of its divisors is an integer number (101602500).

Almost surely, 2^405340121 is an apocalyptic number.

It is an amenable number.

405340121 is a deficient number, since it is larger than the sum of its proper divisors (1069879).

405340121 is a wasteful number, since it uses less digits than its factorization.

405340121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069878.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 405340121 is about 20133.0603982604. The cubic root of 405340121 is about 740.0706780557.

Adding to 405340121 its reverse (121043504), we get a palindrome (526383625).

The spelling of 405340121 in words is "four hundred five million, three hundred forty thousand, one hundred twenty-one".