3651869 has 4 divisors (see below), whose sum is σ = 3932796. Its totient is φ = 3370944.

The previous prime is 3651847. The next prime is 3651919. The reversal of 3651869 is 9681563.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1592644 + 2059225 = 1262^2 + 1435^2 .

It is a cyclic number.

It is not a de Polignac number, because 3651869 - 2¹² = 3647773 is a prime.

It is a super-2 number, since 2×3651869² = 26672294386322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3651839) 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, 140444 + ... + 140469.

It is an arithmetic number, because the mean of its divisors is an integer number (983199).

Almost surely, 2^3651869 is an apocalyptic number.

It is an amenable number.

3651869 is a deficient number, since it is larger than the sum of its proper divisors (280927).

3651869 is a wasteful number, since it uses less digits than its factorization.

3651869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280926.

The product of its digits is 38880, while the sum is 38.

The square root of 3651869 is about 1910.9863945094. The cubic root of 3651869 is about 153.9944479923.

The spelling of 3651869 in words is "three million, six hundred fifty-one thousand, eight hundred sixty-nine".