40131778 has 16 divisors (see below), whose sum is σ = 61513920. Its totient is φ = 19630800.

The previous prime is 40131769. The next prime is 40131797. The reversal of 40131778 is 87713104.

It is a super-2 number, since 2×40131778² = 3221119210882568, which contains 22 as substring.

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, 24963 + ... + 26521.

It is an arithmetic number, because the mean of its divisors is an integer number (3844620).

Almost surely, 2^40131778 is an apocalyptic number.

40131778 is a deficient number, since it is larger than the sum of its proper divisors (21382142).

40131778 is a wasteful number, since it uses less digits than its factorization.

40131778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 40131778 is about 6334.9647197123. The cubic root of 40131778 is about 342.3703396823.

The spelling of 40131778 in words is "forty million, one hundred thirty-one thousand, seven hundred seventy-eight".