1518021 has 12 divisors (see below), whose sum is σ = 2274272. Its totient is φ = 1011852.

The previous prime is 1518007. The next prime is 1518061. The reversal of 1518021 is 1208151.

It is not a de Polignac number, because 1518021 - 2¹¹ = 1515973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1517985 and 1518003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1518001) 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 11 ways as a sum of consecutive naturals, for example, 2881 + ... + 3366.

2^1518021 is an apocalyptic number.

It is an amenable number.

1518021 is a deficient number, since it is larger than the sum of its proper divisors (756251).

1518021 is an frugal number, since it uses more digits than its factorization.

1518021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6262 (or 6250 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 1518021 is about 1232.0799487046. The cubic root of 1518021 is about 114.9280204892.

The spelling of 1518021 in words is "one million, five hundred eighteen thousand, twenty-one".