3947645 has 8 divisors (see below), whose sum is σ = 5101656. Its totient is φ = 2915136.

The previous prime is 3947639. The next prime is 3947659. The reversal of 3947645 is 5467493.

It can be written as a sum of positive squares in 4 ways, for example, as 19321 + 3928324 = 139^2 + 1982^2 .

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 3947645 - 2¹⁴ = 3931261 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3947599 and 3947608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30302 + ... + 30431.

It is an arithmetic number, because the mean of its divisors is an integer number (637707).

Almost surely, 2^3947645 is an apocalyptic number.

It is an amenable number.

3947645 is a deficient number, since it is larger than the sum of its proper divisors (1154011).

3947645 is a wasteful number, since it uses less digits than its factorization.

3947645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60751.

The product of its digits is 90720, while the sum is 38.

The square root of 3947645 is about 1986.8681385537. The cubic root of 3947645 is about 158.0444915562.

The spelling of 3947645 in words is "three million, nine hundred forty-seven thousand, six hundred forty-five".