1620200123 has 4 divisors (see below), whose sum is σ = 1620309240. Its totient is φ = 1620091008.

The previous prime is 1620200119. The next prime is 1620200143. The reversal of 1620200123 is 3210020261.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1620200123 - 2² = 1620200119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620200143) 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, 27965 + ... + 63422.

It is an arithmetic number, because the mean of its divisors is an integer number (405077310).

Almost surely, 2^1620200123 is an apocalyptic number.

1620200123 is a deficient number, since it is larger than the sum of its proper divisors (109117).

1620200123 is an equidigital number, since it uses as much as digits as its factorization.

1620200123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109116.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1620200123 is about 40251.7095661787. The cubic root of 1620200123 is about 1174.5086517827.

Adding to 1620200123 its reverse (3210020261), we get a palindrome (4830220384).

The spelling of 1620200123 in words is "one billion, six hundred twenty million, two hundred thousand, one hundred twenty-three".