1201905 has 32 divisors (see below), whose sum is σ = 2217600. Its totient is φ = 616896.

The previous prime is 1201873. The next prime is 1201909. The reversal of 1201905 is 5091021.

It is not a de Polignac number, because 1201905 - 2⁵ = 1201873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1201909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3762 + ... + 4068.

It is an arithmetic number, because the mean of its divisors is an integer number (69300).

2^1201905 is an apocalyptic number.

1201905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1201905 is a deficient number, since it is larger than the sum of its proper divisors (1015695).

1201905 is a wasteful number, since it uses less digits than its factorization.

1201905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350 (or 344 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 1201905 is about 1096.3142797574. The cubic root of 1201905 is about 106.3220595375.

Adding to 1201905 its reverse (5091021), we get a palindrome (6292926).

It can be divided in two parts, 120 and 1905, that added together give a square (2025 = 45²).

The spelling of 1201905 in words is "one million, two hundred one thousand, nine hundred five".