40251779 has 4 divisors (see below), whose sum is σ = 40289376. Its totient is φ = 40214184.

The previous prime is 40251773. The next prime is 40251781. The reversal of 40251779 is 97715204.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40251779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40251773) 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 3 ways as a sum of consecutive naturals, for example, 17144 + ... + 19349.

It is an arithmetic number, because the mean of its divisors is an integer number (10072344).

Almost surely, 2^40251779 is an apocalyptic number.

40251779 is a deficient number, since it is larger than the sum of its proper divisors (37597).

40251779 is a wasteful number, since it uses less digits than its factorization.

40251779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37596.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 40251779 is about 6344.4289735168. The cubic root of 40251779 is about 342.7112490800.

The spelling of 40251779 in words is "forty million, two hundred fifty-one thousand, seven hundred seventy-nine".