31440400404 has 96 divisors (see below), whose sum is σ = 88304993280. Its totient is φ = 8505243648.

The previous prime is 31440400399. The next prime is 31440400417. The reversal of 31440400404 is 40400404413.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3367687 + ... + 3377009.

It is an arithmetic number, because the mean of its divisors is an integer number (919843680).

Almost surely, 2^31440400404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31440400404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44152496640).

31440400404 is an abundant number, since it is smaller than the sum of its proper divisors (56864592876).

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

31440400404 is a wasteful number, since it uses less digits than its factorization.

31440400404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11469 (or 11467 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 31440400404 its reverse (40400404413), we get a palindrome (71840804817).

The spelling of 31440400404 in words is "thirty-one billion, four hundred forty million, four hundred thousand, four hundred four".