1521020 has 24 divisors (see below), whose sum is σ = 3250800. Its totient is φ = 597632.

The previous prime is 1521017. The next prime is 1521029. The reversal of 1521020 is 201251.

It is a junction number, because it is equal to n+sod(n) for n = 1520992 and 1521010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521029) 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 7 ways as a sum of consecutive naturals, for example, 536 + ... + 1824.

It is an arithmetic number, because the mean of its divisors is an integer number (135450).

2^1521020 is an apocalyptic number.

1521020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1521020 is an abundant number, since it is smaller than the sum of its proper divisors (1729780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1521020 is a wasteful number, since it uses less digits than its factorization.

1521020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357 (or 1355 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 1521020 is about 1233.2963958433. The cubic root of 1521020 is about 115.0036545783.

Adding to 1521020 its reverse (201251), we get a palindrome (1722271).

The spelling of 1521020 in words is "one million, five hundred twenty-one thousand, twenty".