40120019 has 4 divisors (see below), whose sum is σ = 40194720. Its totient is φ = 40045320.

The previous prime is 40120009. The next prime is 40120033. The reversal of 40120019 is 91002104.

It is a happy number.

40120019 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 40120019 - 2⁸ = 40119763 is a prime.

It is a super-2 number, since 2×40120019² = 3219231849120722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40119979 and 40120006.

It is not an unprimeable number, because it can be changed into a prime (40120009) 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, 36539 + ... + 37620.

It is an arithmetic number, because the mean of its divisors is an integer number (10048680).

Almost surely, 2^40120019 is an apocalyptic number.

40120019 is a deficient number, since it is larger than the sum of its proper divisors (74701).

40120019 is an equidigital number, since it uses as much as digits as its factorization.

40120019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74700.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 40120019 is about 6334.0365486789. The cubic root of 40120019 is about 342.3368971395.

The spelling of 40120019 in words is "forty million, one hundred twenty thousand, nineteen".