1243677642 has 16 divisors (see below), whose sum is σ = 2618268960. Its totient is φ = 392740272.

The previous prime is 1243677629. The next prime is 1243677649. The reversal of 1243677642 is 2467763421.

It is a junction number, because it is equal to n+sod(n) for n = 1243677594 and 1243677603.

It is not an unprimeable number, because it can be changed into a prime (1243677649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5454613 + ... + 5454840.

It is an arithmetic number, because the mean of its divisors is an integer number (163641810).

Almost surely, 2^1243677642 is an apocalyptic number.

1243677642 is an abundant number, since it is smaller than the sum of its proper divisors (1374591318).

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

1243677642 is a wasteful number, since it uses less digits than its factorization.

1243677642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10909477.

The product of its digits is 338688, while the sum is 42.

The square root of 1243677642 is about 35265.8140697191. The cubic root of 1243677642 is about 1075.3981267737.

The spelling of 1243677642 in words is "one billion, two hundred forty-three million, six hundred seventy-seven thousand, six hundred forty-two".