1720430 has 16 divisors (see below), whose sum is σ = 3169584. Its totient is φ = 672000.

The previous prime is 1720429. The next prime is 1720457. The reversal of 1720430 is 340271.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1720399 and 1720408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1571 + ... + 2430.

It is an arithmetic number, because the mean of its divisors is an integer number (198099).

2^1720430 is an apocalyptic number.

1720430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1720430 is a deficient number, since it is larger than the sum of its proper divisors (1449154).

1720430 is a wasteful number, since it uses less digits than its factorization.

1720430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 1720430 is about 1311.6516305788. The cubic root of 1720430 is about 119.8245120100.

It can be divided in two parts, 1720 and 430, that multiplied together give a square (739600 = 860²).

The spelling of 1720430 in words is "one million, seven hundred twenty thousand, four hundred thirty".