77843940 has 24 divisors (see below), whose sum is σ = 217963200. Its totient is φ = 20758368.

The previous prime is 77843933. The next prime is 77843963. The reversal of 77843940 is 4934877.

It is a junction number, because it is equal to n+sod(n) for n = 77843892 and 77843901.

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, 648640 + ... + 648759.

It is an arithmetic number, because the mean of its divisors is an integer number (9081800).

Almost surely, 2^77843940 is an apocalyptic number.

It is an amenable number.

77843940 is an abundant number, since it is smaller than the sum of its proper divisors (140119260).

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

77843940 is a wasteful number, since it uses less digits than its factorization.

77843940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297411 (or 1297409 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 77843940 is about 8822.9212849260. The cubic root of 77843940 is about 426.9807244488.

The spelling of 77843940 in words is "seventy-seven million, eight hundred forty-three thousand, nine hundred forty".