4020019 has 4 divisors (see below), whose sum is σ = 4049080. Its totient is φ = 3990960.

The previous prime is 4020017. The next prime is 4020031. The reversal of 4020019 is 9100204.

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 4020019 - 2¹ = 4020017 is a prime.

It is a super-2 number, since 2×4020019² = 32321105520722, which contains 22 as substring.

It is a Duffinian number.

4020019 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4019984 and 4020011.

It is not an unprimeable number, because it can be changed into a prime (4020011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14322 + ... + 14599.

It is an arithmetic number, because the mean of its divisors is an integer number (1012270).

Almost surely, 2^4020019 is an apocalyptic number.

4020019 is a deficient number, since it is larger than the sum of its proper divisors (29061).

4020019 is a wasteful number, since it uses less digits than its factorization.

4020019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29060.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 4020019 is about 2004.9985037401. The cubic root of 4020019 is about 159.0044828186.

The spelling of 4020019 in words is "four million, twenty thousand, nineteen".