31400401421440 has 128 divisors (see below), whose sum is σ = 76367093465520. Its totient is φ = 12342936453120.

The previous prime is 31400401421437. The next prime is 31400401421509. The reversal of 31400401421440 is 4412410400413.

It can be written as a sum of positive squares in 8 ways, for example, as 23428000701504 + 7972400719936 = 4840248^2 + 2823544^2 .

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 31400401421399 and 31400401421408.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42302782 + ... + 43038658.

Almost surely, 2^{31400401421440} 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 31400401421440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38183546732760).

31400401421440 is an abundant number, since it is smaller than the sum of its proper divisors (44966692044080).

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

31400401421440 is a wasteful number, since it uses less digits than its factorization.

31400401421440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737050 (or 737038 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 31400401421440 its reverse (4412410400413), we get a palindrome (35812811821853).

The spelling of 31400401421440 in words is "thirty-one trillion, four hundred billion, four hundred one million, four hundred twenty-one thousand, four hundred forty".