843213540 has 96 divisors (see below), whose sum is σ = 2676481920. Its totient is φ = 196632576.

The previous prime is 843213479. The next prime is 843213601. The reversal of 843213540 is 45312348.

It is an interprime number because it is at equal distance from previous prime (843213479) and next prime (843213601).

It is a super-2 number, since 2×843213540² = 1422018148078663200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 843213498 and 843213507.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 13629 + ... + 43268.

It is an arithmetic number, because the mean of its divisors is an integer number (27880020).

Almost surely, 2^843213540 is an apocalyptic number.

It is an amenable number.

843213540 is an abundant number, since it is smaller than the sum of its proper divisors (1833268380).

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

843213540 is a wasteful number, since it uses less digits than its factorization.

843213540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56941 (or 56939 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 843213540 is about 29038.1394032056. The cubic root of 843213540 is about 944.7404791121.

Adding to 843213540 its reverse (45312348), we get a palindrome (888525888).

The spelling of 843213540 in words is "eight hundred forty-three million, two hundred thirteen thousand, five hundred forty".