3997913 has 4 divisors (see below), whose sum is σ = 4002048. Its totient is φ = 3993780.

The previous prime is 3997909. The next prime is 3997919. The reversal of 3997913 is 3197993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3197993 = 97 ⋅32969.

It is a cyclic number.

It is not a de Polignac number, because 3997913 - 2² = 3997909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3997919) 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, 248 + ... + 2838.

It is an arithmetic number, because the mean of its divisors is an integer number (1000512).

Almost surely, 2^3997913 is an apocalyptic number.

It is an amenable number.

3997913 is a deficient number, since it is larger than the sum of its proper divisors (4135).

3997913 is a wasteful number, since it uses less digits than its factorization.

3997913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4134.

The product of its digits is 45927, while the sum is 41.

The square root of 3997913 is about 1999.4781819265. The cubic root of 3997913 is about 158.7124928441.

The spelling of 3997913 in words is "three million, nine hundred ninety-seven thousand, nine hundred thirteen".