1200840 has 32 divisors (see below), whose sum is σ = 3602880. Its totient is φ = 320192.

The previous prime is 1200839. The next prime is 1200869. The reversal of 1200840 is 480021.

Added to its reverse (480021) it gives a triangular number (1680861 = T₁₈₃₃).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4884 + ... + 5123.

It is an arithmetic number, because the mean of its divisors is an integer number (112590).

2^1200840 is an apocalyptic number.

1200840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200840 is an abundant number, since it is smaller than the sum of its proper divisors (2402040).

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

1200840 is a wasteful number, since it uses less digits than its factorization.

1200840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10021 (or 10017 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1200840 is about 1095.8284537280. The cubic root of 1200840 is about 106.2906465015.

Adding to 1200840 its reverse (480021), we get a palindrome (1680861).

The spelling of 1200840 in words is "one million, two hundred thousand, eight hundred forty".