40009778 has 32 divisors (see below), whose sum is σ = 64281600. Its totient is φ = 18648000.

The previous prime is 40009777. The next prime is 40009813. The reversal of 40009778 is 87790004.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (40009777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268448 + ... + 268596.

It is an arithmetic number, because the mean of its divisors is an integer number (2008800).

Almost surely, 2^40009778 is an apocalyptic number.

40009778 is a deficient number, since it is larger than the sum of its proper divisors (24271822).

40009778 is a wasteful number, since it uses less digits than its factorization.

40009778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 40009778 is about 6325.3282918755. The cubic root of 40009778 is about 342.0230539730.

The spelling of 40009778 in words is "forty million, nine thousand, seven hundred seventy-eight".