1520243 has 4 divisors (see below), whose sum is σ = 1531320. Its totient is φ = 1509168.

The previous prime is 1520227. The next prime is 1520251. The reversal of 1520243 is 3420251.

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

It is a cyclic number.

It is not a de Polignac number, because 1520243 - 2⁴ = 1520227 is a prime.

It is a super-3 number, since 3×1520243³ = 10540477652633366721, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1520203) 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, 5330 + ... + 5607.

It is an arithmetic number, because the mean of its divisors is an integer number (382830).

2^1520243 is an apocalyptic number.

1520243 is a deficient number, since it is larger than the sum of its proper divisors (11077).

1520243 is a wasteful number, since it uses less digits than its factorization.

1520243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11076.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 1520243 is about 1232.9813461687. The cubic root of 1520243 is about 114.9840683664.

Adding to 1520243 its reverse (3420251), we get a palindrome (4940494).

The spelling of 1520243 in words is "one million, five hundred twenty thousand, two hundred forty-three".