3638765 has 32 divisors (see below), whose sum is σ = 5171040. Its totient is φ = 2433024.

The previous prime is 3638759. The next prime is 3638771. The reversal of 3638765 is 5678363.

3638765 = T₁₁₆ + T₁₁₇ + ... + T₂₈₅.

It is an interprime number because it is at equal distance from previous prime (3638759) and next prime (3638771).

It can be written as a sum of positive squares in 16 ways, for example, as 687241 + 2951524 = 829^2 + 1718^2 .

It is a cyclic number.

It is not a de Polignac number, because 3638765 - 2¹² = 3634669 is a prime.

It is a super-2 number, since 2×3638765² = 26481221450450, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40841 + ... + 40929.

It is an arithmetic number, because the mean of its divisors is an integer number (161595).

Almost surely, 2^3638765 is an apocalyptic number.

It is an amenable number.

3638765 is a deficient number, since it is larger than the sum of its proper divisors (1532275).

3638765 is a wasteful number, since it uses less digits than its factorization.

3638765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161.

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

The square root of 3638765 is about 1907.5547174328. The cubic root of 3638765 is about 153.8100345015.

The spelling of 3638765 in words is "three million, six hundred thirty-eight thousand, seven hundred sixty-five".