40840778 has 16 divisors (see below), whose sum is σ = 69736896. Its totient is φ = 17756640.

The previous prime is 40840777. The next prime is 40840829. The reversal of 40840778 is 87704804.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40840771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39851 + ... + 40862.

It is an arithmetic number, because the mean of its divisors is an integer number (4358556).

Almost surely, 2^40840778 is an apocalyptic number.

40840778 is a deficient number, since it is larger than the sum of its proper divisors (28896118).

40840778 is a wasteful number, since it uses less digits than its factorization.

40840778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80749.

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 40840778 is about 6390.6789936594. The cubic root of 40840778 is about 344.3747774545.

The spelling of 40840778 in words is "forty million, eight hundred forty thousand, seven hundred seventy-eight".