1238786641 has 2 divisors, whose sum is σ = 1238786642. Its totient is φ = 1238786640.

The previous prime is 1238786623. The next prime is 1238786657. The reversal of 1238786641 is 1466878321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1151177041 + 87609600 = 33929^2 + 9360^2 .

It is a cyclic number.

It is not a de Polignac number, because 1238786641 - 2¹³ = 1238778449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1238786591 and 1238786600.

It is not a weakly prime, because it can be changed into another prime (1238786611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619393320 + 619393321.

It is an arithmetic number, because the mean of its divisors is an integer number (619393321).

Almost surely, 2^1238786641 is an apocalyptic number.

It is an amenable number.

1238786641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238786641 is an equidigital number, since it uses as much as digits as its factorization.

1238786641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 46.

The square root of 1238786641 is about 35196.4009665761. The cubic root of 1238786641 is about 1073.9865382017.

The spelling of 1238786641 in words is "one billion, two hundred thirty-eight million, seven hundred eighty-six thousand, six hundred forty-one".