406521839997 has 192 divisors, whose sum is σ = 758312755200. Its totient is φ = 204155707392.

The previous prime is 406521839981. The next prime is 406521840001. The reversal of 406521839997 is 799938125604.

406521839997 is a `hidden beast` number, since 406 + 5 + 218 + 3 + 9 + 9 + 9 + 7 = 666.

It is not a de Polignac number, because 406521839997 - 2⁴ = 406521839981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406521839597) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 743184078 + ... + 743184624.

It is an arithmetic number, because the mean of its divisors is an integer number (3949545600).

It is a 1-persistent number, because it is pandigital, but 2⋅406521839997 = 813043679994 is not.

Almost surely, 2^406521839997 is an apocalyptic number.

406521839997 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

It is an amenable number.

406521839997 is a deficient number, since it is larger than the sum of its proper divisors (351790915203).

406521839997 is a wasteful number, since it uses less digits than its factorization.

406521839997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112 (or 1109 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 63.

The spelling of 406521839997 in words is "four hundred six billion, five hundred twenty-one million, eight hundred thirty-nine thousand, nine hundred ninety-seven".