978940 has 12 divisors (see below), whose sum is σ = 2055816. Its totient is φ = 391568.

The previous prime is 978931. The next prime is 978947. The reversal of 978940 is 49879.

It is a happy number.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 978940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24454 + ... + 24493.

It is an arithmetic number, because the mean of its divisors is an integer number (171318).

2⁹⁷⁸⁹⁴⁰ is an apocalyptic number.

It is an amenable number.

978940 is an abundant number, since it is smaller than the sum of its proper divisors (1076876).

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

978940 is a wasteful number, since it uses less digits than its factorization.

978940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48956 (or 48954 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 978940 is about 989.4139679629. The cubic root of 978940 is about 99.2930134797.

The spelling of 978940 in words is "nine hundred seventy-eight thousand, nine hundred forty".