1243641456 has 60 divisors (see below), whose sum is σ = 3522436008. Its totient is φ = 409548672.

The previous prime is 1243641439. The next prime is 1243641457. The reversal of 1243641456 is 6541463421.

1243641456 is a `hidden beast` number, since 1 + 2 + 4 + 3 + 641 + 4 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1243641456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243641457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40075 + ... + 63978.

Almost surely, 2^1243641456 is an apocalyptic number.

1243641456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1243641456 is an abundant number, since it is smaller than the sum of its proper divisors (2278794552).

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

1243641456 is a wasteful number, since it uses less digits than its factorization.

1243641456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104150 (or 104141 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 1243641456 is about 35265.3010195575. The cubic root of 1243641456 is about 1075.3876967574.

The spelling of 1243641456 in words is "one billion, two hundred forty-three million, six hundred forty-one thousand, four hundred fifty-six".