1620123685 has 8 divisors (see below), whose sum is σ = 1989361440. Its totient is φ = 1265956944.

The previous prime is 1620123679. The next prime is 1620123689. The reversal of 1620123685 is 5863210261.

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 1620123685 - 2³ = 1620123677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1620123685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620123689) 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, 3767515 + ... + 3767944.

It is an arithmetic number, because the mean of its divisors is an integer number (248670180).

Almost surely, 2^1620123685 is an apocalyptic number.

It is an amenable number.

1620123685 is a deficient number, since it is larger than the sum of its proper divisors (369237755).

1620123685 is an equidigital number, since it uses as much as digits as its factorization.

1620123685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7535507.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1620123685 is about 40250.7600549356. The cubic root of 1620123685 is about 1174.4901811211.

The spelling of 1620123685 in words is "one billion, six hundred twenty million, one hundred twenty-three thousand, six hundred eighty-five".