406661216 has 48 divisors (see below), whose sum is σ = 912933504. Its totient is φ = 176646144.

The previous prime is 406661179. The next prime is 406661219. The reversal of 406661216 is 612166604.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406661219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21680 + ... + 35823.

It is an arithmetic number, because the mean of its divisors is an integer number (19019448).

Almost surely, 2^406661216 is an apocalyptic number.

It is an amenable number.

406661216 is an abundant number, since it is smaller than the sum of its proper divisors (506272288).

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

406661216 is a wasteful number, since it uses less digits than its factorization.

406661216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57543 (or 57535 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 406661216 is about 20165.8428041081. The cubic root of 406661216 is about 740.8738253019.

The spelling of 406661216 in words is "four hundred six million, six hundred sixty-one thousand, two hundred sixteen".