40388779 has 2 divisors, whose sum is σ = 40388780. Its totient is φ = 40388778.

The previous prime is 40388767. The next prime is 40388791. The reversal of 40388779 is 97788304.

It is a balanced prime because it is at equal distance from previous prime (40388767) and next prime (40388791).

It is a cyclic number.

It is not a de Polignac number, because 40388779 - 2⁹ = 40388267 is a prime.

It is a super-2 number, since 2×40388779² = 3262506938221682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40388729) 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 as a sum of consecutive naturals, namely, 20194389 + 20194390.

It is an arithmetic number, because the mean of its divisors is an integer number (20194390).

Almost surely, 2^40388779 is an apocalyptic number.

40388779 is a deficient number, since it is larger than the sum of its proper divisors (1).

40388779 is an equidigital number, since it uses as much as digits as its factorization.

40388779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 40388779 is about 6355.2166760859. The cubic root of 40388779 is about 343.0996234176.

The spelling of 40388779 in words is "forty million, three hundred eighty-eight thousand, seven hundred seventy-nine".