31323400420 has 48 divisors (see below), whose sum is σ = 71501185728. Its totient is φ = 11457463680.

The previous prime is 31323400411. The next prime is 31323400429. The reversal of 31323400420 is 2400432313.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31323400411) and next prime (31323400429).

It is a junction number, because it is equal to n+sod(n) for n = 31323400391 and 31323400400.

It is not an unprimeable number, because it can be changed into a prime (31323400429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 535146 + ... + 590785.

It is an arithmetic number, because the mean of its divisors is an integer number (1489608036).

Almost surely, 2^31323400420 is an apocalyptic number.

It is an amenable number.

31323400420 is an abundant number, since it is smaller than the sum of its proper divisors (40177785308).

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

31323400420 is a wasteful number, since it uses less digits than its factorization.

31323400420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126060 (or 1126058 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 31323400420 its reverse (2400432313), we get a palindrome (33723832733).

The spelling of 31323400420 in words is "thirty-one billion, three hundred twenty-three million, four hundred thousand, four hundred twenty".