1720402 has 8 divisors (see below), whose sum is σ = 2594556. Its totient is φ = 855552.

The previous prime is 1720399. The next prime is 1720421. The reversal of 1720402 is 2040271.

It can be written as a sum of positive squares in 2 ways, for example, as 1718721 + 1681 = 1311^2 + 41^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1843 + ... + 2614.

2^1720402 is an apocalyptic number.

1720402 is a deficient number, since it is larger than the sum of its proper divisors (874154).

1720402 is a wasteful number, since it uses less digits than its factorization.

1720402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4652.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 1720402 is about 1311.6409569696. The cubic root of 1720402 is about 119.8238619585.

Adding to 1720402 its reverse (2040271), we get a palindrome (3760673).

The spelling of 1720402 in words is "one million, seven hundred twenty thousand, four hundred two".