3638723 has 4 divisors (see below), whose sum is σ = 3969528. Its totient is φ = 3307920.

The previous prime is 3638699. The next prime is 3638753. The reversal of 3638723 is 3278363.

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

It is not a de Polignac number, because 3638723 - 2¹² = 3634627 is a prime.

It is an Ulam number.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3638723.

It is not an unprimeable number, because it can be changed into a prime (3638753) 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, 165386 + ... + 165407.

It is an arithmetic number, because the mean of its divisors is an integer number (992382).

Almost surely, 2^3638723 is an apocalyptic number.

3638723 is a deficient number, since it is larger than the sum of its proper divisors (330805).

3638723 is a wasteful number, since it uses less digits than its factorization.

3638723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330804.

The product of its digits is 18144, while the sum is 32.

The square root of 3638723 is about 1907.5437085425. The cubic root of 3638723 is about 153.8094427214.

The spelling of 3638723 in words is "three million, six hundred thirty-eight thousand, seven hundred twenty-three".