31343730 has 64 divisors (see below), whose sum is σ = 86400000. Its totient is φ = 7197120.

The previous prime is 31343717. The next prime is 31343743. The reversal of 31343730 is 3734313.

It is an interprime number because it is at equal distance from previous prime (31343717) and next prime (31343743).

It is a self number, because there is not a number n which added to its sum of digits gives 31343730.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3771 + ... + 8769.

It is an arithmetic number, because the mean of its divisors is an integer number (1350000).

Almost surely, 2^31343730 is an apocalyptic number.

31343730 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31343730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43200000).

31343730 is an abundant number, since it is smaller than the sum of its proper divisors (55056270).

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

31343730 is a wasteful number, since it uses less digits than its factorization.

31343730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5039.

The product of its (nonzero) digits is 2268, while the sum is 24.

The square root of 31343730 is about 5598.5471329623. The cubic root of 31343730 is about 315.2948612181.

The spelling of 31343730 in words is "thirty-one million, three hundred forty-three thousand, seven hundred thirty".