393290987 has 2 divisors, whose sum is σ = 393290988. Its totient is φ = 393290986.

The previous prime is 393290981. The next prime is 393291037. The reversal of 393290987 is 789092393.

It is an a-pointer prime, because the next prime (393291037) can be obtained adding 393290987 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 393290987 - 2⁶ = 393290923 is a prime.

It is not a weakly prime, because it can be changed into another prime (393290981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196645493 + 196645494.

It is an arithmetic number, because the mean of its divisors is an integer number (196645494).

Almost surely, 2^393290987 is an apocalyptic number.

393290987 is a deficient number, since it is larger than the sum of its proper divisors (1).

393290987 is an equidigital number, since it uses as much as digits as its factorization.

393290987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 50.

The square root of 393290987 is about 19831.5654198049. The cubic root of 393290987 is about 732.6636827422.

The spelling of 393290987 in words is "three hundred ninety-three million, two hundred ninety thousand, nine hundred eighty-seven".