1721936 has 10 divisors (see below), whose sum is σ = 3336282. Its totient is φ = 860960.

The previous prime is 1721927. The next prime is 1721983. The reversal of 1721936 is 6391271.

It can be written as a sum of positive squares in only one way, i.e., 1577536 + 144400 = 1256^2 + 380^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1721899 and 1721908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53795 + ... + 53826.

2^1721936 is an apocalyptic number.

1721936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1721936 is a deficient number, since it is larger than the sum of its proper divisors (1614346).

1721936 is a wasteful number, since it uses less digits than its factorization.

1721936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107629 (or 107623 counting only the distinct ones).

The product of its digits is 2268, while the sum is 29.

The square root of 1721936 is about 1312.2255903617. The cubic root of 1721936 is about 119.8594651101.

The spelling of 1721936 in words is "one million, seven hundred twenty-one thousand, nine hundred thirty-six".