31423220340 has 24 divisors (see below), whose sum is σ = 87985017120. Its totient is φ = 8379525408.

The previous prime is 31423220317. The next prime is 31423220351. The reversal of 31423220340 is 4302232413.

It is a super-3 number, since 3×31423220340³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31423220340.

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 7 ways as a sum of consecutive naturals, for example, 261860110 + ... + 261860229.

It is an arithmetic number, because the mean of its divisors is an integer number (3666042380).

Almost surely, 2^31423220340 is an apocalyptic number.

31423220340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31423220340 is an abundant number, since it is smaller than the sum of its proper divisors (56561796780).

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

31423220340 is a wasteful number, since it uses less digits than its factorization.

31423220340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523720351 (or 523720349 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 31423220340 its reverse (4302232413), we get a palindrome (35725452753).

The spelling of 31423220340 in words is "thirty-one billion, four hundred twenty-three million, two hundred twenty thousand, three hundred forty".