31400142420 has 96 divisors (see below), whose sum is σ = 90998046720. Its totient is φ = 8081700480.

The previous prime is 31400142391. The next prime is 31400142437. The reversal of 31400142420 is 2424100413.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 682669 + ... + 727211.

It is an arithmetic number, because the mean of its divisors is an integer number (947896320).

Almost surely, 2^31400142420 is an apocalyptic number.

31400142420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31400142420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45499023360).

31400142420 is an abundant number, since it is smaller than the sum of its proper divisors (59597904300).

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

31400142420 is a wasteful number, since it uses less digits than its factorization.

31400142420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44965 (or 44963 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 31400142420 its reverse (2424100413), we get a palindrome (33824242833).

The spelling of 31400142420 in words is "thirty-one billion, four hundred million, one hundred forty-two thousand, four hundred twenty".