40188019 has 4 divisors (see below), whose sum is σ = 40672296. Its totient is φ = 39703744.

The previous prime is 40188013. The next prime is 40188047. The reversal of 40188019 is 91088104.

40188019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 40188019 - 2⁷ = 40187891 is a prime.

It is a super-2 number, since 2×40188019² = 3230153742288722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40188013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242014 + ... + 242179.

It is an arithmetic number, because the mean of its divisors is an integer number (10168074).

Almost surely, 2^40188019 is an apocalyptic number.

40188019 is a deficient number, since it is larger than the sum of its proper divisors (484277).

40188019 is an equidigital number, since it uses as much as digits as its factorization.

40188019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484276.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 40188019 is about 6339.4021011449. The cubic root of 40188019 is about 342.5301985556.

The spelling of 40188019 in words is "forty million, one hundred eighty-eight thousand, nineteen".