406687640 has 16 divisors (see below), whose sum is σ = 915047280. Its totient is φ = 162675040.

The previous prime is 406687639. The next prime is 406687643. The reversal of 406687640 is 46786604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406687643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5083556 + ... + 5083635.

It is an arithmetic number, because the mean of its divisors is an integer number (57190455).

Almost surely, 2^406687640 is an apocalyptic number.

406687640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

406687640 is an abundant number, since it is smaller than the sum of its proper divisors (508359640).

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

406687640 is a wasteful number, since it uses less digits than its factorization.

406687640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10167202 (or 10167198 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 406687640 is about 20166.4979607268. The cubic root of 406687640 is about 740.8898717677.

The spelling of 406687640 in words is "four hundred six million, six hundred eighty-seven thousand, six hundred forty".