40391788 has 6 divisors (see below), whose sum is σ = 70685636. Its totient is φ = 20195892.

The previous prime is 40391723. The next prime is 40391801. The reversal of 40391788 is 88719304.

It is a self number, because there is not a number n which added to its sum of digits gives 40391788.

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, 5048970 + ... + 5048977.

Almost surely, 2^40391788 is an apocalyptic number.

It is an amenable number.

40391788 is a deficient number, since it is larger than the sum of its proper divisors (30293848).

40391788 is a wasteful number, since it uses less digits than its factorization.

40391788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10097951 (or 10097949 counting only the distinct ones).

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

The square root of 40391788 is about 6355.4534063275. The cubic root of 40391788 is about 343.1081436152.

The spelling of 40391788 in words is "forty million, three hundred ninety-one thousand, seven hundred eighty-eight".