406689620627 has 4 divisors (see below), whose sum is σ = 406709384400. Its totient is φ = 406669856856.

The previous prime is 406689620543. The next prime is 406689620639. The reversal of 406689620627 is 726026986604.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 406689620627 - 2¹⁶ = 406689555091 is a prime.

It is a super-6 number, since 6×406689620627⁶ (a number of 71 digits) contains 666666 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406689620677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9850988 + ... + 9892185.

It is an arithmetic number, because the mean of its divisors is an integer number (101677346100).

Almost surely, 2^406689620627 is an apocalyptic number.

406689620627 is a deficient number, since it is larger than the sum of its proper divisors (19763773).

406689620627 is a wasteful number, since it uses less digits than its factorization.

406689620627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19763772.

The product of its (nonzero) digits is 10450944, while the sum is 56.

The spelling of 406689620627 in words is "four hundred six billion, six hundred eighty-nine million, six hundred twenty thousand, six hundred twenty-seven".