406630640 has 40 divisors (see below), whose sum is σ = 1018143168. Its totient is φ = 150140160.

The previous prime is 406630621. The next prime is 406630649. The reversal of 406630640 is 46036604.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406630649) 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, 194456 + ... + 196535.

Almost surely, 2^406630640 is an apocalyptic number.

406630640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

406630640 is an abundant number, since it is smaller than the sum of its proper divisors (611512528).

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

406630640 is a wasteful number, since it uses less digits than its factorization.

406630640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391017 (or 391011 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 406630640 is about 20165.0846762418. The cubic root of 406630640 is about 740.8552565892.

The spelling of 406630640 in words is "four hundred six million, six hundred thirty thousand, six hundred forty".