3913999 has 4 divisors (see below), whose sum is σ = 3926664. Its totient is φ = 3901336.

The previous prime is 3913993. The next prime is 3914003. The reversal of 3913999 is 9993193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9993193 = 7 ⋅1427599.

It is a cyclic number.

It is not a de Polignac number, because 3913999 - 2³ = 3913991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3913991) 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, 5857 + ... + 6490.

It is an arithmetic number, because the mean of its divisors is an integer number (981666).

Almost surely, 2^3913999 is an apocalyptic number.

3913999 is a deficient number, since it is larger than the sum of its proper divisors (12665).

3913999 is a wasteful number, since it uses less digits than its factorization.

3913999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12664.

The product of its digits is 59049, while the sum is 43.

The square root of 3913999 is about 1978.3829255228. The cubic root of 3913999 is about 157.5942024846.

The spelling of 3913999 in words is "three million, nine hundred thirteen thousand, nine hundred ninety-nine".