387994897 has 4 divisors (see below), whose sum is σ = 388624356. Its totient is φ = 387365440.

The previous prime is 387994847. The next prime is 387994903. The reversal of 387994897 is 798499783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798499783 = 4273 ⋅186871.

It can be written as a sum of positive squares in 2 ways, for example, as 56791296 + 331203601 = 7536^2 + 18199^2 .

It is a cyclic number.

It is not a de Polignac number, because 387994897 - 2⁷ = 387994769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387994847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313804 + ... + 315037.

It is an arithmetic number, because the mean of its divisors is an integer number (97156089).

Almost surely, 2^387994897 is an apocalyptic number.

It is an amenable number.

387994897 is a deficient number, since it is larger than the sum of its proper divisors (629459).

387994897 is an equidigital number, since it uses as much as digits as its factorization.

387994897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629458.

The product of its digits is 27433728, while the sum is 64.

The square root of 387994897 is about 19697.5860703793. The cubic root of 387994897 is about 729.3601054191.

The spelling of 387994897 in words is "three hundred eighty-seven million, nine hundred ninety-four thousand, eight hundred ninety-seven".