1231604 has 24 divisors (see below), whose sum is σ = 2455488. Its totient is φ = 535040.

The previous prime is 1231597. The next prime is 1231613. The reversal of 1231604 is 4061321.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 404 + ... + 1620.

It is an arithmetic number, because the mean of its divisors is an integer number (102312).

2^1231604 is an apocalyptic number.

It is an amenable number.

1231604 is a deficient number, since it is larger than the sum of its proper divisors (1223884).

1231604 is a wasteful number, since it uses less digits than its factorization.

1231604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255 (or 1253 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1231604 is about 1109.7765540865. The cubic root of 1231604 is about 107.1906810419.

Adding to 1231604 its reverse (4061321), we get a palindrome (5292925).

The spelling of 1231604 in words is "one million, two hundred thirty-one thousand, six hundred four".