1531604 has 12 divisors (see below), whose sum is σ = 2689344. Its totient is φ = 763224.

The previous prime is 1531591. The next prime is 1531619. The reversal of 1531604 is 4061351.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1439 + ... + 2265.

It is an arithmetic number, because the mean of its divisors is an integer number (224112).

2^1531604 is an apocalyptic number.

It is an amenable number.

1531604 is a deficient number, since it is larger than the sum of its proper divisors (1157740).

1531604 is a wasteful number, since it uses less digits than its factorization.

1531604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294 (or 1292 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1531604 is about 1237.5798964107. The cubic root of 1531604 is about 115.2697887637.

Adding to 1531604 its reverse (4061351), we get a palindrome (5592955).

The spelling of 1531604 in words is "one million, five hundred thirty-one thousand, six hundred four".