40863978 has 24 divisors (see below), whose sum is σ = 88671648. Its totient is φ = 13600872.

The previous prime is 40863973. The next prime is 40864001. The reversal of 40863978 is 87936804.

It is a happy number.

40863978 is a `hidden beast` number, since 4 + 0 + 8 + 639 + 7 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40863973) 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, 15075 + ... + 17577.

It is an arithmetic number, because the mean of its divisors is an integer number (3694652).

Almost surely, 2^40863978 is an apocalyptic number.

40863978 is an abundant number, since it is smaller than the sum of its proper divisors (47807670).

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

40863978 is a wasteful number, since it uses less digits than its factorization.

40863978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418 (or 3415 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 40863978 is about 6392.4938795434. The cubic root of 40863978 is about 344.4399735882.

The spelling of 40863978 in words is "forty million, eight hundred sixty-three thousand, nine hundred seventy-eight".