406646140 has 24 divisors (see below), whose sum is σ = 860195952. Its totient is φ = 161470080.

The previous prime is 406646111. The next prime is 406646147. The reversal of 406646140 is 41646604.

It is a super-2 number, since 2×406646140² = 330722166353799200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406646147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71466 + ... + 76945.

It is an arithmetic number, because the mean of its divisors is an integer number (35841498).

Almost surely, 2^406646140 is an apocalyptic number.

It is an amenable number.

406646140 is an abundant number, since it is smaller than the sum of its proper divisors (453549812).

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

406646140 is a wasteful number, since it uses less digits than its factorization.

406646140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148557 (or 148555 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 406646140 is about 20165.4690002489. The cubic root of 406646140 is about 740.8646698088.

The spelling of 406646140 in words is "four hundred six million, six hundred forty-six thousand, one hundred forty".