40423978 has 16 divisors (see below), whose sum is σ = 70079040. Its totient is φ = 17129376.

The previous prime is 40423967. The next prime is 40423993. The reversal of 40423978 is 87932404.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14976 + ... + 17467.

It is an arithmetic number, because the mean of its divisors is an integer number (4379940).

Almost surely, 2^40423978 is an apocalyptic number.

40423978 is a deficient number, since it is larger than the sum of its proper divisors (29655062).

40423978 is a wasteful number, since it uses less digits than its factorization.

40423978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32541.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 40423978 is about 6357.9853727419. The cubic root of 40423978 is about 343.1992654248.

The spelling of 40423978 in words is "forty million, four hundred twenty-three thousand, nine hundred seventy-eight".