4000019 has 4 divisors (see below), whose sum is σ = 4048296. Its totient is φ = 3951744.

The previous prime is 3999971. The next prime is 4000037. The reversal of 4000019 is 9100004.

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 4000019 - 2⁸ = 3999763 is a prime.

It is a super-2 number, since 2×4000019² = 32000304000722, 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 = 3999967 and 4000012.

It is not an unprimeable number, because it can be changed into a prime (4000039) 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, 24014 + ... + 24179.

It is an arithmetic number, because the mean of its divisors is an integer number (1012074).

Almost surely, 2^4000019 is an apocalyptic number.

4000019 is a deficient number, since it is larger than the sum of its proper divisors (48277).

4000019 is an equidigital number, since it uses as much as digits as its factorization.

4000019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48276.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 4000019 is about 2000.0047499944. The cubic root of 4000019 is about 158.7403565349.

The spelling of 4000019 in words is "four million, nineteen", and thus it is an aban number.