1261604 has 12 divisors (see below), whose sum is σ = 2337804. Its totient is φ = 593664.

The previous prime is 1261571. The next prime is 1261627. The reversal of 1261604 is 4061621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 487204 + 774400 = 698^2 + 880^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9209 + ... + 9344.

It is an arithmetic number, because the mean of its divisors is an integer number (194817).

2^1261604 is an apocalyptic number.

It is an amenable number.

1261604 is a deficient number, since it is larger than the sum of its proper divisors (1076200).

1261604 is a wasteful number, since it uses less digits than its factorization.

1261604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18574 (or 18572 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1261604 is about 1123.2114671779. The cubic root of 1261604 is about 108.0540424546.

It can be divided in two parts, 12 and 61604, that added together give a palindrome (61616).

The spelling of 1261604 in words is "one million, two hundred sixty-one thousand, six hundred four".