40387979 has 8 divisors (see below), whose sum is σ = 41783280. Its totient is φ = 39008736.

The previous prime is 40387973. The next prime is 40388003. The reversal of 40387979 is 97978304.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40387979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40387973) 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, 1217 + ... + 9069.

It is an arithmetic number, because the mean of its divisors is an integer number (5222910).

Almost surely, 2^40387979 is an apocalyptic number.

40387979 is a deficient number, since it is larger than the sum of its proper divisors (1395301).

40387979 is a wasteful number, since it uses less digits than its factorization.

40387979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8029.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 40387979 is about 6355.1537353553. The cubic root of 40387979 is about 343.0973580895.

The spelling of 40387979 in words is "forty million, three hundred eighty-seven thousand, nine hundred seventy-nine".