1243642012 has 24 divisors (see below), whose sum is σ = 2231283600. Its totient is φ = 606157440.

The previous prime is 1243642009. The next prime is 1243642019. The reversal of 1243642012 is 2102463421.

It is a happy number.

It is a super-2 number, since 2×1243642012² = 3093290908022816288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243642019) 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, 271114 + ... + 275662.

It is an arithmetic number, because the mean of its divisors is an integer number (92970150).

Almost surely, 2^1243642012 is an apocalyptic number.

It is an amenable number.

1243642012 is a deficient number, since it is larger than the sum of its proper divisors (987641588).

1243642012 is a wasteful number, since it uses less digits than its factorization.

1243642012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6261 (or 6259 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 1243642012 is about 35265.3089026596. The cubic root of 1243642012 is about 1075.3878570168.

The spelling of 1243642012 in words is "one billion, two hundred forty-three million, six hundred forty-two thousand, twelve".