31400189784 has 72 divisors (see below), whose sum is σ = 88213840260. Its totient is φ = 10464125616.

The previous prime is 31400189771. The next prime is 31400189801. The reversal of 31400189784 is 48798100413.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7810927 + ... + 7814945.

Almost surely, 2^31400189784 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 31400189784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44106920130).

31400189784 is an abundant number, since it is smaller than the sum of its proper divisors (56813650476).

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

31400189784 is an frugal number, since it uses more digits than its factorization.

31400189784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8059 (or 4024 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 31400189784 in words is "thirty-one billion, four hundred million, one hundred eighty-nine thousand, seven hundred eighty-four".