1720941257 has 8 divisors (see below), whose sum is σ = 2014760832. Its totient is φ = 1439114400.

The previous prime is 1720941251. The next prime is 1720941301. The reversal of 1720941257 is 7521490271.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1720941257 - 2¹⁰ = 1720940233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1720941257.

It is not an unprimeable number, because it can be changed into a prime (1720941251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2997869 + ... + 2998442.

It is an arithmetic number, because the mean of its divisors is an integer number (251845104).

Almost surely, 2^1720941257 is an apocalyptic number.

It is an amenable number.

1720941257 is a deficient number, since it is larger than the sum of its proper divisors (293819575).

1720941257 is an equidigital number, since it uses as much as digits as its factorization.

1720941257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5996359.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 1720941257 is about 41484.2290153740. The cubic root of 1720941257 is about 1198.3638017731.

The spelling of 1720941257 in words is "one billion, seven hundred twenty million, nine hundred forty-one thousand, two hundred fifty-seven".