1247420 has 24 divisors (see below), whose sum is σ = 2650704. Its totient is φ = 493056.

The previous prime is 1247419. The next prime is 1247429. The reversal of 1247420 is 247421.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1247392 and 1247401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247429) 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, 1619 + ... + 2261.

It is an arithmetic number, because the mean of its divisors is an integer number (110446).

2^1247420 is an apocalyptic number.

1247420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1247420 is an abundant number, since it is smaller than the sum of its proper divisors (1403284).

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

1247420 is a wasteful number, since it uses less digits than its factorization.

1247420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749 (or 747 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 1247420 is about 1116.8795816918. The cubic root of 1247420 is about 107.6475709003.

Subtracting from 1247420 its reverse (247421), we obtain a palindrome (999999).

The spelling of 1247420 in words is "one million, two hundred forty-seven thousand, four hundred twenty".