1638713 has 4 divisors (see below), whose sum is σ = 1646160. Its totient is φ = 1631268.

The previous prime is 1638701. The next prime is 1638719. The reversal of 1638713 is 3178361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3178361 = 41 ⋅77521.

It is a cyclic number.

It is not a de Polignac number, because 1638713 - 2⁶ = 1638649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1638719) 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, 3383 + ... + 3836.

It is an arithmetic number, because the mean of its divisors is an integer number (411540).

2^1638713 is an apocalyptic number.

It is an amenable number.

1638713 is a deficient number, since it is larger than the sum of its proper divisors (7447).

1638713 is an equidigital number, since it uses as much as digits as its factorization.

1638713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7446.

The product of its digits is 3024, while the sum is 29.

The square root of 1638713 is about 1280.1222597862. The cubic root of 1638713 is about 117.8965146520.

The spelling of 1638713 in words is "one million, six hundred thirty-eight thousand, seven hundred thirteen".