1261606 has 4 divisors (see below), whose sum is σ = 1892412. Its totient is φ = 630802.

The previous prime is 1261571. The next prime is 1261627. The reversal of 1261606 is 6061621.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315400 + ... + 315403.

It is an arithmetic number, because the mean of its divisors is an integer number (473103).

2^1261606 is an apocalyptic number.

1261606 is a deficient number, since it is larger than the sum of its proper divisors (630806).

1261606 is an equidigital number, since it uses as much as digits as its factorization.

1261606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630805.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1261606 is about 1123.2123574819. The cubic root of 1261606 is about 108.0540995534.

The spelling of 1261606 in words is "one million, two hundred sixty-one thousand, six hundred six".