1243473981 has 8 divisors (see below), whose sum is σ = 1745226720. Its totient is φ = 785351952.

The previous prime is 1243473967. The next prime is 1243473991. The reversal of 1243473981 is 1893743421.

1243473981 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1243473981 - 2⁵ = 1243473949 is a prime.

It is a super-2 number, since 2×1243473981² = 3092455082847976722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243473901) 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, 10907610 + ... + 10907723.

It is an arithmetic number, because the mean of its divisors is an integer number (218153340).

Almost surely, 2^1243473981 is an apocalyptic number.

It is an amenable number.

1243473981 is a deficient number, since it is larger than the sum of its proper divisors (501752739).

1243473981 is a wasteful number, since it uses less digits than its factorization.

1243473981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21815355.

The product of its digits is 145152, while the sum is 42.

The square root of 1243473981 is about 35262.9264383999. The cubic root of 1243473981 is about 1075.3394222223.

The spelling of 1243473981 in words is "one billion, two hundred forty-three million, four hundred seventy-three thousand, nine hundred eighty-one".