843940749 has 16 divisors (see below), whose sum is σ = 1137879360. Its totient is φ = 556329600.

The previous prime is 843940739. The next prime is 843940759. The reversal of 843940749 is 947049348.

It is an interprime number because it is at equal distance from previous prime (843940739) and next prime (843940759).

It is not a de Polignac number, because 843940749 - 2²³ = 835552141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 843940698 and 843940707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (843940729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331122 + ... + 333660.

It is an arithmetic number, because the mean of its divisors is an integer number (71117460).

Almost surely, 2^843940749 is an apocalyptic number.

It is an amenable number.

843940749 is a deficient number, since it is larger than the sum of its proper divisors (293938611).

843940749 is a wasteful number, since it uses less digits than its factorization.

843940749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3740.

The product of its (nonzero) digits is 870912, while the sum is 48.

The square root of 843940749 is about 29050.6583230053. The cubic root of 843940749 is about 945.0119905536.

The spelling of 843940749 in words is "eight hundred forty-three million, nine hundred forty thousand, seven hundred forty-nine".