978543940 has 36 divisors (see below), whose sum is σ = 2258743788. Its totient is φ = 355833280.

The previous prime is 978543899. The next prime is 978543959. The reversal of 978543940 is 49345879.

It can be written as a sum of positive squares in 2 ways, for example, as 719205124 + 259338816 = 26818^2 + 16104^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 199759 + ... + 204598.

It is an arithmetic number, because the mean of its divisors is an integer number (62742883).

Almost surely, 2^978543940 is an apocalyptic number.

It is an amenable number.

978543940 is an abundant number, since it is smaller than the sum of its proper divisors (1280199848).

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

978543940 is a wasteful number, since it uses less digits than its factorization.

978543940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404388 (or 404375 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 978543940 is about 31281.6869749699. The cubic root of 978543940 is about 992.7962100225.

The spelling of 978543940 in words is "nine hundred seventy-eight million, five hundred forty-three thousand, nine hundred forty".