3865945 has 8 divisors (see below), whose sum is σ = 4764744. Its totient is φ = 3009024.

The previous prime is 3865943. The next prime is 3865951. The reversal of 3865945 is 5495683.

It can be written as a sum of positive squares in 4 ways, for example, as 1218816 + 2647129 = 1104^2 + 1627^2 .

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 3865945 - 2¹ = 3865943 is a prime.

It is a super-3 number, since 3×3865945³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

3865945 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3865898 and 3865907.

It is not an unprimeable number, because it can be changed into a prime (3865943) 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, 10264 + ... + 10633.

It is an arithmetic number, because the mean of its divisors is an integer number (595593).

Almost surely, 2^3865945 is an apocalyptic number.

It is an amenable number.

3865945 is a deficient number, since it is larger than the sum of its proper divisors (898799).

3865945 is a wasteful number, since it uses less digits than its factorization.

3865945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20939.

The product of its digits is 129600, while the sum is 40.

The square root of 3865945 is about 1966.2006510018. The cubic root of 3865945 is about 156.9465922441.

The spelling of 3865945 in words is "three million, eight hundred sixty-five thousand, nine hundred forty-five".