4009819 has 12 divisors (see below), whose sum is σ = 4553920. Its totient is φ = 3524400.

The previous prime is 4009799. The next prime is 4009823. The reversal of 4009819 is 9189004.

It is not a de Polignac number, because 4009819 - 2⁵ = 4009787 is a prime.

It is a super-2 number, since 2×4009819² = 32157296825522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4009849) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3217 + ... + 4285.

Almost surely, 2^4009819 is an apocalyptic number.

4009819 is a deficient number, since it is larger than the sum of its proper divisors (544101).

4009819 is a wasteful number, since it uses less digits than its factorization.

4009819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122 (or 1111 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 4009819 is about 2002.4532453968. The cubic root of 4009819 is about 158.8698881509.

The spelling of 4009819 in words is "four million, nine thousand, eight hundred nineteen".