405621108 has 60 divisors (see below), whose sum is σ = 1062422592. Its totient is φ = 134946000.

The previous prime is 405621091. The next prime is 405621113. The reversal of 405621108 is 801126504.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 242491 + ... + 244157.

Almost surely, 2^405621108 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 405621108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (531211296).

405621108 is an abundant number, since it is smaller than the sum of its proper divisors (656801484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405621108 is a wasteful number, since it uses less digits than its factorization.

405621108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2434 (or 2423 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 405621108 is about 20140.0374378997. The cubic root of 405621108 is about 740.2416474022.

The spelling of 405621108 in words is "four hundred five million, six hundred twenty-one thousand, one hundred eight".