38778940 has 24 divisors (see below), whose sum is σ = 82201392. Its totient is φ = 15365760.

The previous prime is 38778917. The next prime is 38778941. The reversal of 38778940 is 4987783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38778941) 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, 6921 + ... + 11200.

It is an arithmetic number, because the mean of its divisors is an integer number (3425058).

Almost surely, 2^38778940 is an apocalyptic number.

It is an amenable number.

38778940 is an abundant number, since it is smaller than the sum of its proper divisors (43422452).

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

38778940 is a wasteful number, since it uses less digits than its factorization.

38778940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18237 (or 18235 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 38778940 is about 6227.2738818844. The cubic root of 38778940 is about 338.4791937972.

The spelling of 38778940 in words is "thirty-eight million, seven hundred seventy-eight thousand, nine hundred forty".