1243217456 has 40 divisors (see below), whose sum is σ = 2596188000. Its totient is φ = 573313536.

The previous prime is 1243217453. The next prime is 1243217461. The reversal of 1243217456 is 6547123421.

It is a super-2 number, since 2×1243217456² = 3091179285806223872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1243217453) 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, 413045 + ... + 416043.

It is an arithmetic number, because the mean of its divisors is an integer number (64904700).

Almost surely, 2^1243217456 is an apocalyptic number.

1243217456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1243217456 is an abundant number, since it is smaller than the sum of its proper divisors (1352970544).

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

1243217456 is a wasteful number, since it uses less digits than its factorization.

1243217456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5013 (or 5007 counting only the distinct ones).

The product of its digits is 40320, while the sum is 35.

The square root of 1243217456 is about 35259.2889321382. The cubic root of 1243217456 is about 1075.2654706906.

The spelling of 1243217456 in words is "one billion, two hundred forty-three million, two hundred seventeen thousand, four hundred fifty-six".