1538729 has 4 divisors (see below), whose sum is σ = 1541376. Its totient is φ = 1536084.

The previous prime is 1538701. The next prime is 1538731. The reversal of 1538729 is 9278351.

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: 9278351 = 71 ⋅130681.

It is a cyclic number.

It is not a de Polignac number, because 1538729 - 2⁸ = 1538473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1538029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29 + ... + 1754.

It is an arithmetic number, because the mean of its divisors is an integer number (385344).

2^1538729 is an apocalyptic number.

It is an amenable number.

1538729 is a deficient number, since it is larger than the sum of its proper divisors (2647).

1538729 is an equidigital number, since it uses as much as digits as its factorization.

1538729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2646.

The product of its digits is 15120, while the sum is 35.

The square root of 1538729 is about 1240.4551583995. The cubic root of 1538729 is about 115.4482567776.

The spelling of 1538729 in words is "one million, five hundred thirty-eight thousand, seven hundred twenty-nine".