1620172303 has 8 divisors (see below), whose sum is σ = 1624658688. Its totient is φ = 1615693464.

The previous prime is 1620172291. The next prime is 1620172331. The reversal of 1620172303 is 3032710261.

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 1620172303 - 2⁵ = 1620172271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620172363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 971076 + ... + 972742.

It is an arithmetic number, because the mean of its divisors is an integer number (203082336).

Almost surely, 2^1620172303 is an apocalyptic number.

1620172303 is a deficient number, since it is larger than the sum of its proper divisors (4486385).

1620172303 is a wasteful number, since it uses less digits than its factorization.

1620172303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3773.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 1620172303 is about 40251.3639893110. The cubic root of 1620172303 is about 1174.5019293584.

Adding to 1620172303 its reverse (3032710261), we get a palindrome (4652882564).

The spelling of 1620172303 in words is "one billion, six hundred twenty million, one hundred seventy-two thousand, three hundred three".