3872645 has 8 divisors (see below), whose sum is σ = 5311104. Its totient is φ = 2655504.

The previous prime is 3872591. The next prime is 3872647. The reversal of 3872645 is 5462783.

It is a happy number.

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 3872645 - 2⁸ = 3872389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 110647 = 3872645 / (3 + 8 + 7 + 2 + 6 + 4 + 5).

It is a d-powerful number, because it can be written as 3⁶ + 8 + 7⁷ + 2³ + 6⁶ + 4¹⁰ + 5⁹ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3872647) 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, 55289 + ... + 55358.

It is an arithmetic number, because the mean of its divisors is an integer number (663888).

Almost surely, 2^3872645 is an apocalyptic number.

3872645 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3872645 is a deficient number, since it is larger than the sum of its proper divisors (1438459).

3872645 is a wasteful number, since it uses less digits than its factorization.

3872645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110659.

The product of its digits is 40320, while the sum is 35.

The square root of 3872645 is about 1967.9037069938. The cubic root of 3872645 is about 157.0372070255.

The spelling of 3872645 in words is "three million, eight hundred seventy-two thousand, six hundred forty-five".