405342121 has 4 divisors (see below), whose sum is σ = 405475200. Its totient is φ = 405209044.

The previous prime is 405342109. The next prime is 405342149. The reversal of 405342121 is 121243504.

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 405342121 - 2⁹ = 405341609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 405342092 and 405342101.

It is not an unprimeable number, because it can be changed into a prime (405342221) 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, 61861 + ... + 68098.

It is an arithmetic number, because the mean of its divisors is an integer number (101368800).

Almost surely, 2^405342121 is an apocalyptic number.

It is an amenable number.

405342121 is a deficient number, since it is larger than the sum of its proper divisors (133079).

405342121 is a wasteful number, since it uses less digits than its factorization.

405342121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133078.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 405342121 is about 20133.1100677466. The cubic root of 405342121 is about 740.0718952548.

Adding to 405342121 its reverse (121243504), we get a palindrome (526585625).

The spelling of 405342121 in words is "four hundred five million, three hundred forty-two thousand, one hundred twenty-one".