40381778 has 16 divisors (see below), whose sum is σ = 62740224. Its totient is φ = 19472880.

The previous prime is 40381753. The next prime is 40381787. The reversal of 40381778 is 87718304.

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, 20576 + ... + 22452.

It is an arithmetic number, because the mean of its divisors is an integer number (3921264).

Almost surely, 2^40381778 is an apocalyptic number.

40381778 is a deficient number, since it is larger than the sum of its proper divisors (22358446).

40381778 is a wasteful number, since it uses less digits than its factorization.

40381778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2257.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 40381778 is about 6354.6658448734. The cubic root of 40381778 is about 343.0797979502.

The spelling of 40381778 in words is "forty million, three hundred eighty-one thousand, seven hundred seventy-eight".