939978 has 48 divisors (see below), whose sum is σ = 2283840. Its totient is φ = 286416.

The previous prime is 939973. The next prime is 939989. The reversal of 939978 is 879939.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (939971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9075 + ... + 9177.

It is an arithmetic number, because the mean of its divisors is an integer number (47580).

2⁹³⁹⁹⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 939978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1141920).

939978 is an abundant number, since it is smaller than the sum of its proper divisors (1343862).

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

939978 is a wasteful number, since it uses less digits than its factorization.

939978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 121 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 939978 is about 969.5246257832. The cubic root of 939978 is about 97.9578466495.

The spelling of 939978 in words is "nine hundred thirty-nine thousand, nine hundred seventy-eight".