1201920 has 72 divisors (see below), whose sum is σ = 3850896. Its totient is φ = 319488.

The previous prime is 1201919. The next prime is 1201939. The reversal of 1201920 is 291021.

It is a happy number.

It is a super-2 number, since 2×1201920² = 2889223372800, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1201920.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3684 + ... + 3996.

2^1201920 is an apocalyptic number.

1201920 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 1201920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1925448).

1201920 is an abundant number, since it is smaller than the sum of its proper divisors (2648976).

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

1201920 is an equidigital number, since it uses as much as digits as its factorization.

1201920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1201920 is about 1096.3211208401. The cubic root of 1201920 is about 106.3225018421.

Adding to 1201920 its reverse (291021), we get a palindrome (1492941).

It can be divided in two parts, 120 and 1920, that multiplied together give a square (230400 = 480²).

The spelling of 1201920 in words is "one million, two hundred one thousand, nine hundred twenty".