1291772 has 24 divisors (see below), whose sum is σ = 2486400. Its totient is φ = 584496.

The previous prime is 1291691. The next prime is 1291783. The reversal of 1291772 is 2771921.

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, 1379 + ... + 2117.

It is an arithmetic number, because the mean of its divisors is an integer number (103600).

2^1291772 is an apocalyptic number.

It is an amenable number.

1291772 is a deficient number, since it is larger than the sum of its proper divisors (1194628).

1291772 is a wasteful number, since it uses less digits than its factorization.

1291772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785 (or 783 counting only the distinct ones).

The product of its digits is 1764, while the sum is 29.

The square root of 1291772 is about 1136.5614809591. The cubic root of 1291772 is about 108.9085448959.

The spelling of 1291772 in words is "one million, two hundred ninety-one thousand, seven hundred seventy-two".