3999739 has 2 divisors, whose sum is σ = 3999740. Its totient is φ = 3999738.

The previous prime is 3999733. The next prime is 3999763. The reversal of 3999739 is 9379993.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3999739 - 2⁵ = 3999707 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3999692 and 3999701.

It is not a weakly prime, because it can be changed into another prime (3999733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999869 + 1999870.

It is an arithmetic number, because the mean of its divisors is an integer number (1999870).

Almost surely, 2^3999739 is an apocalyptic number.

3999739 is a deficient number, since it is larger than the sum of its proper divisors (1).

3999739 is an equidigital number, since it uses as much as digits as its factorization.

3999739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 413343, while the sum is 49.

The square root of 3999739 is about 1999.9347489356. The cubic root of 3999739 is about 158.7366525244.

The spelling of 3999739 in words is "three million, nine hundred ninety-nine thousand, seven hundred thirty-nine".