3967639 has 8 divisors (see below), whose sum is σ = 4294080. Its totient is φ = 3644256.

The previous prime is 3967627. The next prime is 3967651. The reversal of 3967639 is 9367693.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3967627) and next prime (3967651).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3967639 - 2⁹ = 3967127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3967595 and 3967604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3967609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2469 + ... + 3745.

It is an arithmetic number, because the mean of its divisors is an integer number (536760).

Almost surely, 2^3967639 is an apocalyptic number.

3967639 is a deficient number, since it is larger than the sum of its proper divisors (326441).

3967639 is a wasteful number, since it uses less digits than its factorization.

3967639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1529.

The product of its digits is 183708, while the sum is 43.

The square root of 3967639 is about 1991.8933204366. The cubic root of 3967639 is about 158.3108631701.

The spelling of 3967639 in words is "three million, nine hundred sixty-seven thousand, six hundred thirty-nine".