1261906 has 8 divisors (see below), whose sum is σ = 1958220. Its totient is φ = 609168.

The previous prime is 1261901. The next prime is 1261913. The reversal of 1261906 is 6091621.

It can be written as a sum of positive squares in 2 ways, for example, as 1177225 + 84681 = 1085^2 + 291^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1261901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10821 + ... + 10936.

2^1261906 is an apocalyptic number.

1261906 is a deficient number, since it is larger than the sum of its proper divisors (696314).

1261906 is a wasteful number, since it uses less digits than its factorization.

1261906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21788.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1261906 is about 1123.3458950831. The cubic root of 1261906 is about 108.0626636800.

The spelling of 1261906 in words is "one million, two hundred sixty-one thousand, nine hundred six".