1201840 has 40 divisors (see below), whose sum is σ = 2843568. Its totient is φ = 472320.

The previous prime is 1201829. The next prime is 1201841. The reversal of 1201840 is 481021.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (1201841) 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, 6550 + ... + 6730.

2^1201840 is an apocalyptic number.

1201840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1421784).

1201840 is an abundant number, since it is smaller than the sum of its proper divisors (1641728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1201840 is a wasteful number, since it uses less digits than its factorization.

1201840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277 (or 271 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1201840 is about 1096.2846345726. The cubic root of 1201840 is about 106.3201428418.

Adding to 1201840 its reverse (481021), we get a palindrome (1682861).

The spelling of 1201840 in words is "one million, two hundred one thousand, eight hundred forty".