120645 has 24 divisors (see below), whose sum is σ = 239616. Its totient is φ = 55008.

The previous prime is 120641. The next prime is 120647. The reversal of 120645 is 546021.

It is a happy number.

120645 is a `hidden beast` number, since 1 + 20 + 645 = 666.

It is not a de Polignac number, because 120645 - 2² = 120641 is a prime.

It is a Curzon number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124 + ... + 506.

It is an arithmetic number, because the mean of its divisors is an integer number (9984).

2¹²⁰⁶⁴⁵ is an apocalyptic number.

120645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

120645 is a deficient number, since it is larger than the sum of its proper divisors (118971).

120645 is a wasteful number, since it uses less digits than its factorization.

120645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 120645 is about 347.3398911729. The cubic root of 120645 is about 49.4124562228.

Adding to 120645 its reverse (546021), we get a palindrome (666666).

The spelling of 120645 in words is "one hundred twenty thousand, six hundred forty-five".