3791999 has 4 divisors (see below), whose sum is σ = 3848664. Its totient is φ = 3735336.

The previous prime is 3791981. The next prime is 3792017. The reversal of 3791999 is 9991973.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (3791981) and next prime (3792017).

It is a cyclic number.

It is not a de Polignac number, because 3791999 - 2²⁰ = 2743423 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 (3791959) 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, 28232 + ... + 28365.

It is an arithmetic number, because the mean of its divisors is an integer number (962166).

Almost surely, 2^3791999 is an apocalyptic number.

3791999 is a deficient number, since it is larger than the sum of its proper divisors (56665).

3791999 is an equidigital number, since it uses as much as digits as its factorization.

3791999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56664.

The product of its digits is 137781, while the sum is 47.

The square root of 3791999 is about 1947.3055743771. The cubic root of 3791999 is about 155.9394763024.

The spelling of 3791999 in words is "three million, seven hundred ninety-one thousand, nine hundred ninety-nine".