1521873 has 6 divisors (see below), whose sum is σ = 2198274. Its totient is φ = 1014576.

The previous prime is 1521869. The next prime is 1521893. The reversal of 1521873 is 3781251.

It can be written as a sum of positive squares in only one way, i.e., 986049 + 535824 = 993^2 + 732^2 .

It is not a de Polignac number, because 1521873 - 2² = 1521869 is a prime.

It is an Ulam number.

1521873 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1521803) 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 5 ways as a sum of consecutive naturals, for example, 84540 + ... + 84557.

It is an arithmetic number, because the mean of its divisors is an integer number (366379).

2^1521873 is an apocalyptic number.

It is an amenable number.

1521873 is a deficient number, since it is larger than the sum of its proper divisors (676401).

1521873 is a wasteful number, since it uses less digits than its factorization.

1521873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169103 (or 169100 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 1521873 is about 1233.6421685400. The cubic root of 1521873 is about 115.0251488792.

It can be divided in two parts, 152 and 1873, that added together give a square (2025 = 45²).

The spelling of 1521873 in words is "one million, five hundred twenty-one thousand, eight hundred seventy-three".