3957999 has 4 divisors (see below), whose sum is σ = 5277336. Its totient is φ = 2638664.

The previous prime is 3957983. The next prime is 3958013. The reversal of 3957999 is 9997593.

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 3957999 - 2⁴ = 3957983 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3957929) 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, 659664 + ... + 659669.

It is an arithmetic number, because the mean of its divisors is an integer number (1319334).

Almost surely, 2^3957999 is an apocalyptic number.

3957999 is a deficient number, since it is larger than the sum of its proper divisors (1319337).

3957999 is a wasteful number, since it uses less digits than its factorization.

3957999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319336.

The product of its digits is 688905, while the sum is 51.

The square root of 3957999 is about 1989.4720405173. The cubic root of 3957999 is about 158.1825455173.

The spelling of 3957999 in words is "three million, nine hundred fifty-seven thousand, nine hundred ninety-nine".