1620108723 has 4 divisors (see below), whose sum is σ = 2160144968. Its totient is φ = 1080072480.

The previous prime is 1620108719. The next prime is 1620108757. The reversal of 1620108723 is 3278010261.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1620108723 - 2² = 1620108719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620108023) 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, 270018118 + ... + 270018123.

It is an arithmetic number, because the mean of its divisors is an integer number (540036242).

Almost surely, 2^1620108723 is an apocalyptic number.

1620108723 is a deficient number, since it is larger than the sum of its proper divisors (540036245).

1620108723 is an equidigital number, since it uses as much as digits as its factorization.

1620108723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540036244.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 1620108723 is about 40250.5741946621. The cubic root of 1620108723 is about 1174.4865655996.

Adding to 1620108723 its reverse (3278010261), we get a palindrome (4898118984).

The spelling of 1620108723 in words is "one billion, six hundred twenty million, one hundred eight thousand, seven hundred twenty-three".