40415978 has 4 divisors (see below), whose sum is σ = 60623970. Its totient is φ = 20207988.

The previous prime is 40415957. The next prime is 40416007. The reversal of 40415978 is 87951404.

40415978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 40233649 + 182329 = 6343^2 + 427^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10103993 + ... + 10103996.

Almost surely, 2^40415978 is an apocalyptic number.

40415978 is a deficient number, since it is larger than the sum of its proper divisors (20207992).

40415978 is a wasteful number, since it uses less digits than its factorization.

40415978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20207991.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 40415978 is about 6357.3562115081. The cubic root of 40415978 is about 343.1766239514.

The spelling of 40415978 in words is "forty million, four hundred fifteen thousand, nine hundred seventy-eight".