387209997 has 16 divisors (see below), whose sum is σ = 584470080. Its totient is φ = 253268496.

The previous prime is 387209993. The next prime is 387210007. The reversal of 387209997 is 799902783.

It is not a de Polignac number, because 387209997 - 2² = 387209993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387209993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133863 + ... + 136724.

It is an arithmetic number, because the mean of its divisors is an integer number (36529380).

Almost surely, 2^387209997 is an apocalyptic number.

It is an amenable number.

387209997 is a deficient number, since it is larger than the sum of its proper divisors (197260083).

387209997 is a wasteful number, since it uses less digits than its factorization.

387209997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270649 (or 270643 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 54.

The square root of 387209997 is about 19677.6522227628. The cubic root of 387209997 is about 728.8679501376.

The spelling of 387209997 in words is "three hundred eighty-seven million, two hundred nine thousand, nine hundred ninety-seven".