1720036 has 6 divisors (see below), whose sum is σ = 3010070. Its totient is φ = 860016.

The previous prime is 1720031. The next prime is 1720039. The reversal of 1720036 is 6300271.

It can be written as a sum of positive squares in only one way, i.e., 1705636 + 14400 = 1306^2 + 120^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1719995 and 1720022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215001 + ... + 215008.

2^1720036 is an apocalyptic number.

It is an amenable number.

1720036 is a deficient number, since it is larger than the sum of its proper divisors (1290034).

1720036 is a wasteful number, since it uses less digits than its factorization.

1720036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430013 (or 430011 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 1720036 is about 1311.5014296599. The cubic root of 1720036 is about 119.8153642074.

The spelling of 1720036 in words is "one million, seven hundred twenty thousand, thirty-six".