387993903 has 16 divisors (see below), whose sum is σ = 565488000. Its totient is φ = 234675680.

The previous prime is 387993887. The next prime is 387993911. The reversal of 387993903 is 309399783.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 387993903 - 2⁴ = 387993887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387993103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5248 + ... + 28346.

It is an arithmetic number, because the mean of its divisors is an integer number (35343000).

Almost surely, 2^387993903 is an apocalyptic number.

387993903 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

387993903 is a deficient number, since it is larger than the sum of its proper divisors (177494097).

387993903 is a wasteful number, since it uses less digits than its factorization.

387993903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23622.

The product of its (nonzero) digits is 1102248, while the sum is 51.

The square root of 387993903 is about 19697.5608388450. The cubic root of 387993903 is about 729.3594825719.

The spelling of 387993903 in words is "three hundred eighty-seven million, nine hundred ninety-three thousand, nine hundred three".