401984553687 has 16 divisors (see below), whose sum is σ = 564948245760. Its totient is φ = 253543252032.

The previous prime is 401984553683. The next prime is 401984553721. The reversal of 401984553687 is 786355489104.

It is a happy number.

It is not a de Polignac number, because 401984553687 - 2² = 401984553683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 401984553687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401984553683) 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 15 ways as a sum of consecutive naturals, for example, 4703518 + ... + 4788219.

It is an arithmetic number, because the mean of its divisors is an integer number (35309265360).

Almost surely, 2^401984553687 is an apocalyptic number.

401984553687 is a deficient number, since it is larger than the sum of its proper divisors (162963692073).

401984553687 is a wasteful number, since it uses less digits than its factorization.

401984553687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9492502.

The product of its (nonzero) digits is 29030400, while the sum is 60.

The spelling of 401984553687 in words is "four hundred one billion, nine hundred eighty-four million, five hundred fifty-three thousand, six hundred eighty-seven".