43778940 has 24 divisors (see below), whose sum is σ = 122581200. Its totient is φ = 11674368.

The previous prime is 43778921. The next prime is 43778941. The reversal of 43778940 is 4987734.

It is a junction number, because it is equal to n+sod(n) for n = 43778892 and 43778901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43778941) 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, 364765 + ... + 364884.

It is an arithmetic number, because the mean of its divisors is an integer number (5107550).

Almost surely, 2^43778940 is an apocalyptic number.

It is an amenable number.

43778940 is an abundant number, since it is smaller than the sum of its proper divisors (78802260).

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

43778940 is a wasteful number, since it uses less digits than its factorization.

43778940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729661 (or 729659 counting only the distinct ones).

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

The square root of 43778940 is about 6616.5655743747. The cubic root of 43778940 is about 352.4426142688.

The spelling of 43778940 in words is "forty-three million, seven hundred seventy-eight thousand, nine hundred forty".