1261647 has 12 divisors (see below), whose sum is σ = 1841424. Its totient is φ = 832320.

The previous prime is 1261643. The next prime is 1261649. The reversal of 1261647 is 7461621.

1261647 is a `hidden beast` number, since 1 + 2 + 616 + 47 = 666.

It is not a de Polignac number, because 1261647 - 2² = 1261643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1261647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 247 + ... + 1607.

It is an arithmetic number, because the mean of its divisors is an integer number (153452).

2^1261647 is an apocalyptic number.

1261647 is a deficient number, since it is larger than the sum of its proper divisors (579777).

1261647 is a wasteful number, since it uses less digits than its factorization.

1261647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470 (or 1467 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 1261647 is about 1123.2306085573. The cubic root of 1261647 is about 108.0552700641.

The spelling of 1261647 in words is "one million, two hundred sixty-one thousand, six hundred forty-seven".