1243648266 has 32 divisors (see below), whose sum is σ = 2934325248. Its totient is φ = 343865520.

The previous prime is 1243648261. The next prime is 1243648291. The reversal of 1243648266 is 6628463421.

It is a super-2 number, since 2×1243648266² = 3093322019049613512, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1243648261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 476290 + ... + 478893.

It is an arithmetic number, because the mean of its divisors is an integer number (91697664).

Almost surely, 2^1243648266 is an apocalyptic number.

1243648266 is an abundant number, since it is smaller than the sum of its proper divisors (1690676982).

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

1243648266 is a wasteful number, since it uses less digits than its factorization.

1243648266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955226.

The product of its digits is 331776, while the sum is 42.

The square root of 1243648266 is about 35265.3975732587. The cubic root of 1243648266 is about 1075.3896596428.

The spelling of 1243648266 in words is "one billion, two hundred forty-three million, six hundred forty-eight thousand, two hundred sixty-six".