3638623 has 4 divisors (see below), whose sum is σ = 3796848. Its totient is φ = 3480400.

The previous prime is 3638573. The next prime is 3638639. The reversal of 3638623 is 3268363.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3268363 = 7 ⋅466909.

It is a cyclic number.

It is not a de Polignac number, because 3638623 - 2¹⁷ = 3507551 is a prime.

It is a super-2 number, since 2×3638623² = 26479154672258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3638653) 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, 79078 + ... + 79123.

It is an arithmetic number, because the mean of its divisors is an integer number (949212).

Almost surely, 2^3638623 is an apocalyptic number.

3638623 is a deficient number, since it is larger than the sum of its proper divisors (158225).

3638623 is a wasteful number, since it uses less digits than its factorization.

3638623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158224.

The product of its digits is 15552, while the sum is 31.

The square root of 3638623 is about 1907.5174966432. The cubic root of 3638623 is about 153.8080337028.

The spelling of 3638623 in words is "three million, six hundred thirty-eight thousand, six hundred twenty-three".