213555240 has 48 divisors (see below), whose sum is σ = 694055700. Its totient is φ = 56947968.

The previous prime is 213555239. The next prime is 213555257. The reversal of 213555240 is 42555312.

It is a happy number.

213555240 is a `hidden beast` number, since 2 + 135 + 5 + 524 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 203404644 + 10150596 = 14262^2 + 3186^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 296245 + ... + 296964.

Almost surely, 2^213555240 is an apocalyptic number.

213555240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213555240 is an abundant number, since it is smaller than the sum of its proper divisors (480500460).

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

213555240 is a wasteful number, since it uses less digits than its factorization.

213555240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593226 (or 593219 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 213555240 is about 14613.5293478338. The cubic root of 213555240 is about 597.7277389123.

It can be divided in two parts, 2135 and 55240, that added together give a palindrome (57375).

The spelling of 213555240 in words is "two hundred thirteen million, five hundred fifty-five thousand, two hundred forty".