1522729 has 4 divisors (see below), whose sum is σ = 1639876. Its totient is φ = 1405584.

The previous prime is 1522727. The next prime is 1522733. The reversal of 1522729 is 9272251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9272251 = 353 ⋅26267.

It can be written as a sum of positive squares in 2 ways, for example, as 1000000 + 522729 = 1000^2 + 723^2 .

It is a cyclic number.

It is not a de Polignac number, because 1522729 - 2¹ = 1522727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1522697 and 1522706.

It is not an unprimeable number, because it can be changed into a prime (1522727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58554 + ... + 58579.

It is an arithmetic number, because the mean of its divisors is an integer number (409969).

2^1522729 is an apocalyptic number.

It is an amenable number.

1522729 is a deficient number, since it is larger than the sum of its proper divisors (117147).

1522729 is a wasteful number, since it uses less digits than its factorization.

1522729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117146.

The product of its digits is 2520, while the sum is 28.

The square root of 1522729 is about 1233.9890599191. The cubic root of 1522729 is about 115.0467107031.

The spelling of 1522729 in words is "one million, five hundred twenty-two thousand, seven hundred twenty-nine".