1321872 has 20 divisors (see below), whose sum is σ = 3414960. Its totient is φ = 440608.

The previous prime is 1321867. The next prime is 1321891. The reversal of 1321872 is 2781231.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13722 + ... + 13817.

It is an arithmetic number, because the mean of its divisors is an integer number (170748).

2^1321872 is an apocalyptic number.

1321872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1321872 is an abundant number, since it is smaller than the sum of its proper divisors (2093088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321872 is a wasteful number, since it uses less digits than its factorization.

1321872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27550 (or 27544 counting only the distinct ones).

The product of its digits is 672, while the sum is 24.

The square root of 1321872 is about 1149.7269240998. The cubic root of 1321872 is about 109.7479629069.

The spelling of 1321872 in words is "one million, three hundred twenty-one thousand, eight hundred seventy-two".