387991297 has 2 divisors, whose sum is σ = 387991298. Its totient is φ = 387991296.

The previous prime is 387991283. The next prime is 387991339. The reversal of 387991297 is 792199783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 387459856 + 531441 = 19684^2 + 729^2 .

It is a cyclic number.

It is not a de Polignac number, because 387991297 - 2⁷ = 387991169 is a prime.

It is not a weakly prime, because it can be changed into another prime (387997297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193995648 + 193995649.

It is an arithmetic number, because the mean of its divisors is an integer number (193995649).

Almost surely, 2^387991297 is an apocalyptic number.

It is an amenable number.

387991297 is a deficient number, since it is larger than the sum of its proper divisors (1).

387991297 is an equidigital number, since it uses as much as digits as its factorization.

387991297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 55.

The square root of 387991297 is about 19697.4946884115. The cubic root of 387991297 is about 729.3578496295.

The spelling of 387991297 in words is "three hundred eighty-seven million, nine hundred ninety-one thousand, two hundred ninety-seven".