1921312 has 12 divisors (see below), whose sum is σ = 3782646. Its totient is φ = 960640.

The previous prime is 1921307. The next prime is 1921319. The reversal of 1921312 is 2131291.

It can be written as a sum of positive squares in only one way, i.e., 992016 + 929296 = 996^2 + 964^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1921312.

It is not an unprimeable number, because it can be changed into a prime (1921319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 29989 + ... + 30052.

2^1921312 is an apocalyptic number.

It is an amenable number.

1921312 is a deficient number, since it is larger than the sum of its proper divisors (1861334).

1921312 is an equidigital number, since it uses as much as digits as its factorization.

1921312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60051 (or 60043 counting only the distinct ones).

The product of its digits is 108, while the sum is 19.

The square root of 1921312 is about 1386.1139924263. The cubic root of 1921312 is about 124.3176041327.

The spelling of 1921312 in words is "one million, nine hundred twenty-one thousand, three hundred twelve".