1281772 has 12 divisors (see below), whose sum is σ = 2260440. Its totient is φ = 635936.

The previous prime is 1281751. The next prime is 1281773. The reversal of 1281772 is 2771821.

It is a self number, because there is not a number n which added to its sum of digits gives 1281772.

It is not an unprimeable number, because it can be changed into a prime (1281773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622 + ... + 1717.

It is an arithmetic number, because the mean of its divisors is an integer number (188370).

2^1281772 is an apocalyptic number.

It is an amenable number.

1281772 is a deficient number, since it is larger than the sum of its proper divisors (978668).

1281772 is a wasteful number, since it uses less digits than its factorization.

1281772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2480 (or 2478 counting only the distinct ones).

The product of its digits is 1568, while the sum is 28.

The square root of 1281772 is about 1132.1536998129. The cubic root of 1281772 is about 108.6267851860.

The spelling of 1281772 in words is "one million, two hundred eighty-one thousand, seven hundred seventy-two".