3999007 has 4 divisors (see below), whose sum is σ = 4003096. Its totient is φ = 3994920.

The previous prime is 3999001. The next prime is 3999053. The reversal of 3999007 is 7009993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7009993 = 19 ⋅368947.

It is a cyclic number.

It is not a de Polignac number, because 3999007 - 2³ = 3998999 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 (3999001) 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, 388 + ... + 2854.

It is an arithmetic number, because the mean of its divisors is an integer number (1000774).

Almost surely, 2^3999007 is an apocalyptic number.

3999007 is a deficient number, since it is larger than the sum of its proper divisors (4089).

3999007 is a wasteful number, since it uses less digits than its factorization.

3999007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4088.

The product of its (nonzero) digits is 15309, while the sum is 37.

The square root of 3999007 is about 1999.7517345911. The cubic root of 3999007 is about 158.7269683660.

The spelling of 3999007 in words is "three million, nine hundred ninety-nine thousand, seven".