406321001781 has 8 divisors (see below), whose sum is σ = 549391777344. Its totient is φ = 267065447040.

The previous prime is 406321001773. The next prime is 406321001791. The reversal of 406321001781 is 187100123604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 406321001781 - 2³ = 406321001773 is a prime.

It is a super-2 number, since 2×406321001781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406321001771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 953804956 + ... + 953805381.

It is an arithmetic number, because the mean of its divisors is an integer number (68673972168).

Almost surely, 2^406321001781 is an apocalyptic number.

It is an amenable number.

406321001781 is a deficient number, since it is larger than the sum of its proper divisors (143070775563).

406321001781 is a wasteful number, since it uses less digits than its factorization.

406321001781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907610411.

The product of its (nonzero) digits is 8064, while the sum is 33.

The spelling of 406321001781 in words is "four hundred six billion, three hundred twenty-one million, one thousand, seven hundred eighty-one".