1720398 has 8 divisors (see below), whose sum is σ = 3440808. Its totient is φ = 573464.

The previous prime is 1720379. The next prime is 1720399. The reversal of 1720398 is 8930271.

It is a happy number.

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

1720398 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143361 + ... + 143372.

It is an arithmetic number, because the mean of its divisors is an integer number (430101).

2^1720398 is an apocalyptic number.

1720398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1720398 is a wasteful number, since it uses less digits than its factorization.

1720398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286738.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 1720398 is about 1311.6394321611. The cubic root of 1720398 is about 119.8237690934.

The spelling of 1720398 in words is "one million, seven hundred twenty thousand, three hundred ninety-eight".