4099939 has 4 divisors (see below), whose sum is σ = 4125256. Its totient is φ = 4074624.

The previous prime is 4099903. The next prime is 4099943. The reversal of 4099939 is 9399904.

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 4099939 - 2⁷ = 4099811 is a prime.

It is a Duffinian number.

4099939 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4099895 and 4099904.

It is not an unprimeable number, because it can be changed into a prime (4099339) 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, 12414 + ... + 12739.

It is an arithmetic number, because the mean of its divisors is an integer number (1031314).

Almost surely, 2^4099939 is an apocalyptic number.

4099939 is a deficient number, since it is larger than the sum of its proper divisors (25317).

4099939 is a wasteful number, since it uses less digits than its factorization.

4099939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25316.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 4099939 is about 2024.8306101993. The cubic root of 4099939 is about 160.0512726302.

The spelling of 4099939 in words is "four million, ninety-nine thousand, nine hundred thirty-nine".