31230405000 has 240 divisors, whose sum is σ = 108556485180. Its totient is φ = 8102592000.

The previous prime is 31230404987. The next prime is 31230405007. The reversal of 31230405000 is 50403213.

31230405000 is a `hidden beast` number, since 3 + 123 + 0 + 40 + 500 + 0 = 666.

It can be written as a sum of positive squares in 10 ways, for example, as 1153476 + 31229251524 = 1074^2 + 176718^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31230405007) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1655622 + ... + 1674378.

Almost surely, 2^31230405000 is an apocalyptic number.

31230405000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31230405000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54278242590).

31230405000 is an abundant number, since it is smaller than the sum of its proper divisors (77326080180).

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

31230405000 is a wasteful number, since it uses less digits than its factorization.

31230405000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18826 (or 18804 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

Adding to 31230405000 its reverse (50403213), we get a palindrome (31280808213).

The spelling of 31230405000 in words is "thirty-one billion, two hundred thirty million, four hundred five thousand".