215455812 has 192 divisors, whose sum is σ = 634023936. Its totient is φ = 56010240.

The previous prime is 215455811. The next prime is 215455813. The reversal of 215455812 is 218554512.

It is an interprime number because it is at equal distance from previous prime (215455811) and next prime (215455813).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (215455811) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 2091753 + ... + 2091855.

It is an arithmetic number, because the mean of its divisors is an integer number (3302208).

Almost surely, 2^215455812 is an apocalyptic number.

215455812 is a gapful number since it is divisible by the number (22) 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 215455812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317011968).

215455812 is an abundant number, since it is smaller than the sum of its proper divisors (418568124).

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

215455812 is a wasteful number, since it uses less digits than its factorization.

215455812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 208 counting only the distinct ones).

The product of its digits is 16000, while the sum is 33.

The square root of 215455812 is about 14678.4131294905. The cubic root of 215455812 is about 599.4956984743.

The spelling of 215455812 in words is "two hundred fifteen million, four hundred fifty-five thousand, eight hundred twelve".