40391782 has 4 divisors (see below), whose sum is σ = 60587676. Its totient is φ = 20195890.

The previous prime is 40391723. The next prime is 40391801. The reversal of 40391782 is 28719304.

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

It is a congruent number.

It is an unprimeable number.

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, 10097944 + ... + 10097947.

It is an arithmetic number, because the mean of its divisors is an integer number (15146919).

Almost surely, 2^40391782 is an apocalyptic number.

40391782 is a deficient number, since it is larger than the sum of its proper divisors (20195894).

40391782 is a wasteful number, since it uses less digits than its factorization.

40391782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20195893.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 40391782 is about 6355.4529342919. The cubic root of 40391782 is about 343.1081266261.

The spelling of 40391782 in words is "forty million, three hundred ninety-one thousand, seven hundred eighty-two".