40781894 has 4 divisors (see below), whose sum is σ = 61172844. Its totient is φ = 20390946.

The previous prime is 40781893. The next prime is 40781911. The reversal of 40781894 is 49818704.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40781893) 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 as a sum of consecutive naturals, namely, 10195472 + ... + 10195475.

It is an arithmetic number, because the mean of its divisors is an integer number (15293211).

Almost surely, 2^40781894 is an apocalyptic number.

40781894 is a deficient number, since it is larger than the sum of its proper divisors (20390950).

40781894 is a wasteful number, since it uses less digits than its factorization.

40781894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20390949.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 40781894 is about 6386.0703096662. The cubic root of 40781894 is about 344.2091919878.

The spelling of 40781894 in words is "forty million, seven hundred eighty-one thousand, eight hundred ninety-four".