40783891 has 8 divisors (see below), whose sum is σ = 41693184. Its totient is φ = 39884040.

The previous prime is 40783877. The next prime is 40783903. The reversal of 40783891 is 19838704.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40783891 - 2⁷ = 40783763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40783091) 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 7 ways as a sum of consecutive naturals, for example, 6756 + ... + 11278.

It is an arithmetic number, because the mean of its divisors is an integer number (5211648).

Almost surely, 2^40783891 is an apocalyptic number.

40783891 is a deficient number, since it is larger than the sum of its proper divisors (909293).

40783891 is a wasteful number, since it uses less digits than its factorization.

40783891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4721.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 40783891 is about 6386.2266636880. The cubic root of 40783891 is about 344.2148102861.

The spelling of 40783891 in words is "forty million, seven hundred eighty-three thousand, eight hundred ninety-one".