1247620 has 48 divisors (see below), whose sum is σ = 2939328. Its totient is φ = 440960.

The previous prime is 1247611. The next prime is 1247621. The reversal of 1247620 is 267421.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 1247591 and 1247600.

It is not an unprimeable number, because it can be changed into a prime (1247621) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 11607 + ... + 11713.

It is an arithmetic number, because the mean of its divisors is an integer number (61236).

2^1247620 is an apocalyptic number.

1247620 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 1247620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1469664).

1247620 is an abundant number, since it is smaller than the sum of its proper divisors (1691708).

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

1247620 is a wasteful number, since it uses less digits than its factorization.

1247620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 1247620 is about 1116.9691132704. The cubic root of 1247620 is about 107.6533236710.

It can be divided in two parts, 124 and 7620, that added together give a square (7744 = 88²).

The spelling of 1247620 in words is "one million, two hundred forty-seven thousand, six hundred twenty".