1521345 has 16 divisors (see below), whose sum is σ = 2782080. Its totient is φ = 695424.

The previous prime is 1521337. The next prime is 1521361. The reversal of 1521345 is 5431251.

It is not a de Polignac number, because 1521345 - 2³ = 1521337 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7140 + ... + 7349.

It is an arithmetic number, because the mean of its divisors is an integer number (173880).

2^1521345 is an apocalyptic number.

1521345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1521345 is a deficient number, since it is larger than the sum of its proper divisors (1260735).

1521345 is a wasteful number, since it uses less digits than its factorization.

1521345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14504.

The product of its digits is 600, while the sum is 21.

The square root of 1521345 is about 1233.4281495085. The cubic root of 1521345 is about 115.0118450307.

Adding to 1521345 its reverse (5431251), we get a palindrome (6952596).

The spelling of 1521345 in words is "one million, five hundred twenty-one thousand, three hundred forty-five".