3999743 has 16 divisors (see below), whose sum is σ = 4699296. Its totient is φ = 3363840.

The previous prime is 3999739. The next prime is 3999763. The reversal of 3999743 is 3479993.

It is a happy number.

It is not a de Polignac number, because 3999743 - 2² = 3999739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3999694 and 3999703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999703) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13505 + ... + 13797.

It is an arithmetic number, because the mean of its divisors is an integer number (293706).

Almost surely, 2^3999743 is an apocalyptic number.

3999743 is a deficient number, since it is larger than the sum of its proper divisors (699553).

3999743 is a wasteful number, since it uses less digits than its factorization.

3999743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394.

The product of its digits is 183708, while the sum is 44.

The square root of 3999743 is about 1999.9357489680. The cubic root of 3999743 is about 158.7367054401.

The spelling of 3999743 in words is "three million, nine hundred ninety-nine thousand, seven hundred forty-three".