789978 has 24 divisors (see below), whose sum is σ = 1838592. Its totient is φ = 225624.

The previous prime is 789977. The next prime is 789979. The reversal of 789978 is 879987.

789978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (789977) and next prime (789979).

It is not an unprimeable number, because it can be changed into a prime (789977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1050 + ... + 1637.

It is an arithmetic number, because the mean of its divisors is an integer number (76608).

2⁷⁸⁹⁹⁷⁸ is an apocalyptic number.

789978 is an abundant number, since it is smaller than the sum of its proper divisors (1048614).

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

789978 is a wasteful number, since it uses less digits than its factorization.

789978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2706 (or 2699 counting only the distinct ones).

The product of its digits is 254016, while the sum is 48.

The square root of 789978 is about 888.8070656785. The cubic root of 789978 is about 92.4424965218.

Subtracting 789978 from its reverse (879987), we obtain a palindrome (90009).

The spelling of 789978 in words is "seven hundred eighty-nine thousand, nine hundred seventy-eight".