3909999 has 8 divisors (see below), whose sum is σ = 5381632. Its totient is φ = 2522520.

The previous prime is 3909979. The next prime is 3910001. The reversal of 3909999 is 9999093.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3909999 - 2⁵ = 3909967 is a prime.

It is a Duffinian number.

3909999 is a modest number, since divided by 9999 gives 390 as remainder.

3909999 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3909959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20929 + ... + 21114.

It is an arithmetic number, because the mean of its divisors is an integer number (672704).

Almost surely, 2^3909999 is an apocalyptic number.

3909999 is a deficient number, since it is larger than the sum of its proper divisors (1471633).

3909999 is a wasteful number, since it uses less digits than its factorization.

3909999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42077.

The product of its (nonzero) digits is 177147, while the sum is 48.

The square root of 3909999 is about 1977.3717404676. The cubic root of 3909999 is about 157.5404985299.

The spelling of 3909999 in words is "three million, nine hundred nine thousand, nine hundred ninety-nine".