1261870 has 16 divisors (see below), whose sum is σ = 2284848. Its totient is φ = 501760.

The previous prime is 1261861. The next prime is 1261889. The reversal of 1261870 is 781621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2325 + ... + 2815.

It is an arithmetic number, because the mean of its divisors is an integer number (142803).

2^1261870 is an apocalyptic number.

1261870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261870 is a deficient number, since it is larger than the sum of its proper divisors (1022978).

1261870 is a wasteful number, since it uses less digits than its factorization.

1261870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1261870 is about 1123.3298714091. The cubic root of 1261870 is about 108.0616360565.

Subtracting from 1261870 its reverse (781621), we obtain a square (480249 = 693²).

The spelling of 1261870 in words is "one million, two hundred sixty-one thousand, eight hundred seventy".