40994640 has 80 divisors (see below), whose sum is σ = 141211200. Its totient is φ = 10931328.

The previous prime is 40994627. The next prime is 40994641. The reversal of 40994640 is 4649904.

40994640 is a `hidden beast` number, since 4 + 0 + 9 + 9 + 4 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 40994595 and 40994604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40994641) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 7330 + ... + 11649.

It is an arithmetic number, because the mean of its divisors is an integer number (1765140).

Almost surely, 2^40994640 is an apocalyptic number.

40994640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40994640 is an abundant number, since it is smaller than the sum of its proper divisors (100216560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40994640 is a wasteful number, since it uses less digits than its factorization.

40994640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19001 (or 18989 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 40994640 is about 6402.7056780708. The cubic root of 40994640 is about 344.8066970058.

The spelling of 40994640 in words is "forty million, nine hundred ninety-four thousand, six hundred forty".