213459640 has 64 divisors (see below), whose sum is σ = 492480000. Its totient is φ = 83241600.

The previous prime is 213459613. The next prime is 213459641. The reversal of 213459640 is 46954312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 213459596 and 213459605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213459641) 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 15 ways as a sum of consecutive naturals, for example, 356061 + ... + 356659.

It is an arithmetic number, because the mean of its divisors is an integer number (7695000).

Almost surely, 2^213459640 is an apocalyptic number.

213459640 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 213459640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246240000).

213459640 is an abundant number, since it is smaller than the sum of its proper divisors (279020360).

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

213459640 is a wasteful number, since it uses less digits than its factorization.

213459640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820 (or 816 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 213459640 is about 14610.2580401579. The cubic root of 213459640 is about 597.6385327959.

The spelling of 213459640 in words is "two hundred thirteen million, four hundred fifty-nine thousand, six hundred forty".