3969749 has 4 divisors (see below), whose sum is σ = 4536864. Its totient is φ = 3402636.

The previous prime is 3969737. The next prime is 3969751. The reversal of 3969749 is 9479693.

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.

It is a cyclic number.

It is not a de Polignac number, because 3969749 - 2⁴ = 3969733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3969709) 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, 283547 + ... + 283560.

It is an arithmetic number, because the mean of its divisors is an integer number (1134216).

Almost surely, 2^3969749 is an apocalyptic number.

It is an amenable number.

3969749 is a deficient number, since it is larger than the sum of its proper divisors (567115).

3969749 is an equidigital number, since it uses as much as digits as its factorization.

3969749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567114.

The product of its digits is 367416, while the sum is 47.

The square root of 3969749 is about 1992.4228968771. The cubic root of 3969749 is about 158.3389215633.

The spelling of 3969749 in words is "three million, nine hundred sixty-nine thousand, seven hundred forty-nine".