401231866812 has 24 divisors (see below), whose sum is σ = 1069951645056. Its totient is φ = 114637676208.

The previous prime is 401231866801. The next prime is 401231866913. The reversal of 401231866812 is 218668132104.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2388284838 + ... + 2388285005.

It is an arithmetic number, because the mean of its divisors is an integer number (44581318544).

Almost surely, 2^401231866812 is an apocalyptic number.

401231866812 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

401231866812 is an abundant number, since it is smaller than the sum of its proper divisors (668719778244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401231866812 is a wasteful number, since it uses less digits than its factorization.

401231866812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4776569857 (or 4776569855 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

Adding to 401231866812 its reverse (218668132104), we get a palindrome (619899998916).

The spelling of 401231866812 in words is "four hundred one billion, two hundred thirty-one million, eight hundred sixty-six thousand, eight hundred twelve".