1200945 has 24 divisors (see below), whose sum is σ = 2039616. Its totient is φ = 602272.

The previous prime is 1200943. The next prime is 1200949. The reversal of 1200945 is 5490021.

It is not a de Polignac number, because 1200945 - 2¹ = 1200943 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1200943) 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, 20326 + ... + 20384.

It is an arithmetic number, because the mean of its divisors is an integer number (84984).

2^1200945 is an apocalyptic number.

1200945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1200945 is a deficient number, since it is larger than the sum of its proper divisors (838671).

1200945 is an equidigital number, since it uses as much as digits as its factorization.

1200945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1200945 is about 1095.8763616394. The cubic root of 1200945 is about 106.2937443865.

Adding to 1200945 its reverse (5490021), we get a palindrome (6690966).

It can be divided in two parts, 1200 and 945, that added together give a triangular number (2145 = T₆₅).

The spelling of 1200945 in words is "one million, two hundred thousand, nine hundred forty-five".