405612421 has 8 divisors (see below), whose sum is σ = 420894144. Its totient is φ = 390596640.

The previous prime is 405612407. The next prime is 405612481. The reversal of 405612421 is 124216504.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 405612421 - 2⁷ = 405612293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405612481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63376 + ... + 69481.

It is an arithmetic number, because the mean of its divisors is an integer number (52611768).

Almost surely, 2^405612421 is an apocalyptic number.

It is an amenable number.

405612421 is a deficient number, since it is larger than the sum of its proper divisors (15281723).

405612421 is a wasteful number, since it uses less digits than its factorization.

405612421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132971.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 405612421 is about 20139.8217718032. The cubic root of 405612421 is about 740.2363628933.

Adding to 405612421 its reverse (124216504), we get a palindrome (529828925).

The spelling of 405612421 in words is "four hundred five million, six hundred twelve thousand, four hundred twenty-one".