215412500 has 72 divisors (see below), whose sum is σ = 496530720. Its totient is φ = 81540000.

The previous prime is 215412479. The next prime is 215412541. The reversal of 215412500 is 5214512.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 237047 + ... + 237953.

It is an arithmetic number, because the mean of its divisors is an integer number (6896260).

Almost surely, 2^215412500 is an apocalyptic number.

215412500 is a gapful number since it is divisible by the number (20) 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 215412500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248265360).

215412500 is an abundant number, since it is smaller than the sum of its proper divisors (281118220).

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

215412500 is an equidigital number, since it uses as much as digits as its factorization.

215412500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 215412500 is about 14676.9376914941. The cubic root of 215412500 is about 599.4555245788.

The spelling of 215412500 in words is "two hundred fifteen million, four hundred twelve thousand, five hundred".