213343440 has 40 divisors (see below), whose sum is σ = 661365408. Its totient is φ = 56891520.

The previous prime is 213343409. The next prime is 213343447. The reversal of 213343440 is 44343312.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 213343440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213343447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444226 + ... + 444705.

Almost surely, 2^213343440 is an apocalyptic number.

213343440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213343440 is an abundant number, since it is smaller than the sum of its proper divisors (448021968).

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

213343440 is a wasteful number, since it uses less digits than its factorization.

213343440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888947 (or 888941 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

The square root of 213343440 is about 14606.2808407890. The cubic root of 213343440 is about 597.5300685719.

Adding to 213343440 its reverse (44343312), we get a palindrome (257686752).

The spelling of 213343440 in words is "two hundred thirteen million, three hundred forty-three thousand, four hundred forty".