1242905837 has 2 divisors, whose sum is σ = 1242905838. Its totient is φ = 1242905836.

The previous prime is 1242905831. The next prime is 1242905849. The reversal of 1242905837 is 7385092421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1103169796 + 139736041 = 33214^2 + 11821^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242905837 - 2⁶ = 1242905773 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1242905794 and 1242905803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242905831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621452918 + 621452919.

It is an arithmetic number, because the mean of its divisors is an integer number (621452919).

Almost surely, 2^1242905837 is an apocalyptic number.

It is an amenable number.

1242905837 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242905837 is an equidigital number, since it uses as much as digits as its factorization.

1242905837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 1242905837 is about 35254.8696920014. The cubic root of 1242905837 is about 1075.1756228663.

The spelling of 1242905837 in words is "one billion, two hundred forty-two million, nine hundred five thousand, eight hundred thirty-seven".