1291972 has 12 divisors (see below), whose sum is σ = 2466576. Its totient is φ = 587240.

The previous prime is 1291967. The next prime is 1291991. The reversal of 1291972 is 2791921.

It is an Ulam number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 14638 + ... + 14725.

It is an arithmetic number, because the mean of its divisors is an integer number (205548).

2^1291972 is an apocalyptic number.

It is an amenable number.

1291972 is a deficient number, since it is larger than the sum of its proper divisors (1174604).

1291972 is a wasteful number, since it uses less digits than its factorization.

1291972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29378 (or 29376 counting only the distinct ones).

The product of its digits is 2268, while the sum is 31.

The square root of 1291972 is about 1136.6494622354. The cubic root of 1291972 is about 108.9141652337.

The spelling of 1291972 in words is "one million, two hundred ninety-one thousand, nine hundred seventy-two".