1521618 has 16 divisors (see below), whose sum is σ = 3478080. Its totient is φ = 434736.

The previous prime is 1521617. The next prime is 1521623. The reversal of 1521618 is 8161251.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1521613) 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, 18073 + ... + 18156.

It is an arithmetic number, because the mean of its divisors is an integer number (217380).

2^1521618 is an apocalyptic number.

1521618 is an abundant number, since it is smaller than the sum of its proper divisors (1956462).

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

1521618 is a wasteful number, since it uses less digits than its factorization.

1521618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36241.

The product of its digits is 480, while the sum is 24.

The square root of 1521618 is about 1233.5388117121. The cubic root of 1521618 is about 115.0187241094.

Adding to 1521618 its reverse (8161251), we get a palindrome (9682869).

It can be divided in two parts, 152 and 1618, that added together give a triangular number (1770 = T₅₉).

The spelling of 1521618 in words is "one million, five hundred twenty-one thousand, six hundred eighteen".