1209620387 has 2 divisors, whose sum is σ = 1209620388. Its totient is φ = 1209620386.

The previous prime is 1209620353. The next prime is 1209620407. The reversal of 1209620387 is 7830269021.

It is a strong prime.

It is an emirp because it is prime and its reverse (7830269021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1209620387 - 2¹⁶ = 1209554851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1209620387.

It is not a weakly prime, because it can be changed into another prime (1209620987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604810193 + 604810194.

It is an arithmetic number, because the mean of its divisors is an integer number (604810194).

Almost surely, 2^1209620387 is an apocalyptic number.

1209620387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209620387 is an equidigital number, since it uses as much as digits as its factorization.

1209620387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1209620387 is about 34779.5972805897. The cubic root of 1209620387 is about 1065.4907880690.

The spelling of 1209620387 in words is "one billion, two hundred nine million, six hundred twenty thousand, three hundred eighty-seven".