4099969 has 4 divisors (see below), whose sum is σ = 4169520. Its totient is φ = 4030420.

The previous prime is 4099961. The next prime is 4099981. The reversal of 4099969 is 9699904.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4099969 - 2³ = 4099961 is a prime.

It is a super-2 number, since 2×4099969² = 33619491601922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4099961) 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, 34687 + ... + 34804.

It is an arithmetic number, because the mean of its divisors is an integer number (1042380).

Almost surely, 2^4099969 is an apocalyptic number.

It is an amenable number.

4099969 is a deficient number, since it is larger than the sum of its proper divisors (69551).

4099969 is an equidigital number, since it uses as much as digits as its factorization.

4099969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69550.

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 4099969 is about 2024.8380182128. The cubic root of 4099969 is about 160.0516630040.

The spelling of 4099969 in words is "four million, ninety-nine thousand, nine hundred sixty-nine".