401985320869 has 32 divisors (see below), whose sum is σ = 465538498560. Its totient is φ = 343264521600.

The previous prime is 401985320833. The next prime is 401985320887. The reversal of 401985320869 is 968023589104.

It is not a de Polignac number, because 401985320869 - 2²⁹ = 401448449957 is a prime.

It is a super-2 number, since 2×401985320869² (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 (401982320869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53161849 + ... + 53169409.

It is an arithmetic number, because the mean of its divisors is an integer number (14548078080).

Almost surely, 2^401985320869 is an apocalyptic number.

It is an amenable number.

401985320869 is a deficient number, since it is larger than the sum of its proper divisors (63553177691).

401985320869 is a wasteful number, since it uses less digits than its factorization.

401985320869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9721.

The product of its (nonzero) digits is 3732480, while the sum is 55.

The spelling of 401985320869 in words is "four hundred one billion, nine hundred eighty-five million, three hundred twenty thousand, eight hundred sixty-nine".