1247445 has 24 divisors (see below), whose sum is σ = 2277600. Its totient is φ = 629856.

The previous prime is 1247429. The next prime is 1247447. The reversal of 1247445 is 5447421.

It is not a de Polignac number, because 1247445 - 2⁴ = 1247429 is a prime.

It is a super-2 number, since 2×1247445² = 3112238056050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126 + ... + 1584.

It is an arithmetic number, because the mean of its divisors is an integer number (94900).

2^1247445 is an apocalyptic number.

1247445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1247445 is a deficient number, since it is larger than the sum of its proper divisors (1030155).

1247445 is a wasteful number, since it uses less digits than its factorization.

1247445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489 (or 1486 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 1247445 is about 1116.8907735316. The cubic root of 1247445 is about 107.6482900302.

It can be divided in two parts, 124 and 7445, that added together give a square (7569 = 87²).

The spelling of 1247445 in words is "one million, two hundred forty-seven thousand, four hundred forty-five".