1371220 has 48 divisors (see below), whose sum is σ = 3160080. Its totient is φ = 497664.

The previous prime is 1371217. The next prime is 1371229. The reversal of 1371220 is 221731.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 213444 + 1157776 = 462^2 + 1076^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1371194 and 1371203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1371229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12526 + ... + 12634.

It is an arithmetic number, because the mean of its divisors is an integer number (65835).

2^1371220 is an apocalyptic number.

1371220 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 1371220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1580040).

1371220 is an abundant number, since it is smaller than the sum of its proper divisors (1788860).

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

1371220 is a wasteful number, since it uses less digits than its factorization.

1371220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 1371220 is about 1170.9910332705. The cubic root of 1371220 is about 111.0970122852.

Adding to 1371220 its reverse (221731), we get a palindrome (1592951).

The spelling of 1371220 in words is "one million, three hundred seventy-one thousand, two hundred twenty".