3999517 has 2 divisors, whose sum is σ = 3999518. Its totient is φ = 3999516.

The previous prime is 3999511. The next prime is 3999529. The reversal of 3999517 is 7159993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3261636 + 737881 = 1806^2 + 859^2 .

It is a cyclic number.

It is not a de Polignac number, because 3999517 - 2⁷ = 3999389 is a prime.

It is a super-2 number, since 2×3999517² = 31992272466578, which contains 22 as substring.

3999517 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3999511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999758 + 1999759.

It is an arithmetic number, because the mean of its divisors is an integer number (1999759).

Almost surely, 2^3999517 is an apocalyptic number.

It is an amenable number.

3999517 is a deficient number, since it is larger than the sum of its proper divisors (1).

3999517 is an equidigital number, since it uses as much as digits as its factorization.

3999517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76545, while the sum is 43.

The square root of 3999517 is about 1999.8792463546. The cubic root of 3999517 is about 158.7337156504.

The spelling of 3999517 in words is "three million, nine hundred ninety-nine thousand, five hundred seventeen".