397763987 has 2 divisors, whose sum is σ = 397763988. Its totient is φ = 397763986.

The previous prime is 397763983. The next prime is 397764013. The reversal of 397763987 is 789367793.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 397763987 - 2² = 397763983 is a prime.

It is not a weakly prime, because it can be changed into another prime (397763983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198881993 + 198881994.

It is an arithmetic number, because the mean of its divisors is an integer number (198881994).

Almost surely, 2^397763987 is an apocalyptic number.

397763987 is a deficient number, since it is larger than the sum of its proper divisors (1).

397763987 is an equidigital number, since it uses as much as digits as its factorization.

397763987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12002256, while the sum is 59.

The square root of 397763987 is about 19944.0213347259. The cubic root of 397763987 is about 735.4308098036.

The spelling of 397763987 in words is "three hundred ninety-seven million, seven hundred sixty-three thousand, nine hundred eighty-seven".