1291672 has 8 divisors (see below), whose sum is σ = 2421900. Its totient is φ = 645832.

The previous prime is 1291669. The next prime is 1291673. The reversal of 1291672 is 2761921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1291672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80722 + ... + 80737.

2^1291672 is an apocalyptic number.

It is an amenable number.

1291672 is a deficient number, since it is larger than the sum of its proper divisors (1130228).

1291672 is a wasteful number, since it uses less digits than its factorization.

1291672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161465 (or 161461 counting only the distinct ones).

The product of its digits is 1512, while the sum is 28.

The square root of 1291672 is about 1136.5174877669. The cubic root of 1291672 is about 108.9057345095.

The spelling of 1291672 in words is "one million, two hundred ninety-one thousand, six hundred seventy-two".