213500440 has 32 divisors (see below), whose sum is σ = 480934080. Its totient is φ = 85300992.

The previous prime is 213500411. The next prime is 213500453. The reversal of 213500440 is 44005312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38737 + ... + 43903.

It is an arithmetic number, because the mean of its divisors is an integer number (15029190).

Almost surely, 2^213500440 is an apocalyptic number.

213500440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213500440 is an abundant number, since it is smaller than the sum of its proper divisors (267433640).

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

213500440 is a wasteful number, since it uses less digits than its factorization.

213500440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6211 (or 6207 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 213500440 is about 14611.6542526847. The cubic root of 213500440 is about 597.6766072827.

Adding to 213500440 its reverse (44005312), we get a palindrome (257505752).

The spelling of 213500440 in words is "two hundred thirteen million, five hundred thousand, four hundred forty".