406646646 has 32 divisors (see below), whose sum is σ = 942217728. Its totient is φ = 114592320.

The previous prime is 406646641. The next prime is 406646689. The reversal of 406646646 is 646646604.

It is a super-2 number, since 2×406646646² = 330722989406098632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 406646598 and 406646607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406646641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63250 + ... + 69381.

It is an arithmetic number, because the mean of its divisors is an integer number (29444304).

Almost surely, 2^406646646 is an apocalyptic number.

406646646 is an abundant number, since it is smaller than the sum of its proper divisors (535571082).

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

406646646 is a wasteful number, since it uses less digits than its factorization.

406646646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132716.

The product of its (nonzero) digits is 497664, while the sum is 42.

The square root of 406646646 is about 20165.4815464447. The cubic root of 406646646 is about 740.8649771009.

Subtracting from 406646646 its sum of digits (42), we obtain a palindrome (406646604).

The spelling of 406646646 in words is "four hundred six million, six hundred forty-six thousand, six hundred forty-six".