1985385707 has 2 divisors, whose sum is σ = 1985385708. Its totient is φ = 1985385706.

The previous prime is 1985385683. The next prime is 1985385719. The reversal of 1985385707 is 7075835891.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1985385707 - 2¹⁸ = 1985123563 is a prime.

It is not a weakly prime, because it can be changed into another prime (1985385407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992692853 + 992692854.

It is an arithmetic number, because the mean of its divisors is an integer number (992692854).

Almost surely, 2^1985385707 is an apocalyptic number.

1985385707 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985385707 is an equidigital number, since it uses as much as digits as its factorization.

1985385707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2116800, while the sum is 53.

The square root of 1985385707 is about 44557.6672077882. The cubic root of 1985385707 is about 1256.8447354261.

The spelling of 1985385707 in words is "one billion, nine hundred eighty-five million, three hundred eighty-five thousand, seven hundred seven".