31430000 has 100 divisors (see below), whose sum is σ = 87159600. Its totient is φ = 10752000.

The previous prime is 31429999. The next prime is 31430011. The reversal of 31430000 is 3413.

It is a tau number, because it is divible by the number of its divisors (100).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 69776 + ... + 70224.

It is an arithmetic number, because the mean of its divisors is an integer number (871596).

Almost surely, 2^31430000 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 31430000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43579800).

31430000 is an abundant number, since it is smaller than the sum of its proper divisors (55729600).

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

31430000 is an equidigital number, since it uses as much as digits as its factorization.

31430000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484 (or 463 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 31430000 is about 5606.2465161639. The cubic root of 31430000 is about 315.5838671359.

Adding to 31430000 its reverse (3413), we get a palindrome (31433413).

The spelling of 31430000 in words is "thirty-one million, four hundred thirty thousand".