215045400 has 96 divisors (see below), whose sum is σ = 695669760. Its totient is φ = 54848640.

The previous prime is 215045387. The next prime is 215045491. The reversal of 215045400 is 4540512.

It is a super-2 number, since 2×215045400² = 92489048122320000, which contains 22 as substring.

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, 6009 + ... + 21591.

It is an arithmetic number, because the mean of its divisors is an integer number (7246560).

Almost surely, 2^215045400 is an apocalyptic number.

215045400 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 215045400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (347834880).

215045400 is an abundant number, since it is smaller than the sum of its proper divisors (480624360).

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

215045400 is a wasteful number, since it uses less digits than its factorization.

215045400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15625 (or 15616 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 215045400 is about 14664.4263440477. The cubic root of 215045400 is about 599.1148058054.

Adding to 215045400 its reverse (4540512), we get a palindrome (219585912).

The spelling of 215045400 in words is "two hundred fifteen million, forty-five thousand, four hundred".