3925639 has 4 divisors (see below), whose sum is σ = 3963856. Its totient is φ = 3887424.

The previous prime is 3925637. The next prime is 3925667. The reversal of 3925639 is 9365293.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9365293 = 7 ⋅1337899.

It is a cyclic number.

It is not a de Polignac number, because 3925639 - 2¹ = 3925637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3925598 and 3925607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3925631) 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, 18954 + ... + 19159.

It is an arithmetic number, because the mean of its divisors is an integer number (990964).

Almost surely, 2^3925639 is an apocalyptic number.

3925639 is a deficient number, since it is larger than the sum of its proper divisors (38217).

3925639 is a wasteful number, since it uses less digits than its factorization.

3925639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38216.

The product of its digits is 43740, while the sum is 37.

The square root of 3925639 is about 1981.3225381043. The cubic root of 3925639 is about 157.7502731302.

The spelling of 3925639 in words is "three million, nine hundred twenty-five thousand, six hundred thirty-nine".