40681394 has 16 divisors (see below), whose sum is σ = 69175680. Its totient is φ = 17787600.

The previous prime is 40681349. The next prime is 40681423. The reversal of 40681394 is 49318604.

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 a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40682 + ... + 41669.

It is an arithmetic number, because the mean of its divisors is an integer number (4323480).

Almost surely, 2^40681394 is an apocalyptic number.

40681394 is a deficient number, since it is larger than the sum of its proper divisors (28494286).

40681394 is a wasteful number, since it uses less digits than its factorization.

40681394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82385.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 40681394 is about 6378.1967671122. The cubic root of 40681394 is about 343.9262111879.

Adding to 40681394 its reverse (49318604), we get a palindrome (89999998).

The spelling of 40681394 in words is "forty million, six hundred eighty-one thousand, three hundred ninety-four".