387990523 has 4 divisors (see below), whose sum is σ = 388501128. Its totient is φ = 387479920.

The previous prime is 387990521. The next prime is 387990539. The reversal of 387990523 is 325099783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325099783 = 41 ⋅7929263.

It is a cyclic number.

It is not a de Polignac number, because 387990523 - 2¹ = 387990521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387990521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254161 + ... + 255682.

It is an arithmetic number, because the mean of its divisors is an integer number (97125282).

Almost surely, 2^387990523 is an apocalyptic number.

387990523 is a deficient number, since it is larger than the sum of its proper divisors (510605).

387990523 is an equidigital number, since it uses as much as digits as its factorization.

387990523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510604.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 387990523 is about 19697.4750412331. The cubic root of 387990523 is about 729.3573646330.

The spelling of 387990523 in words is "three hundred eighty-seven million, nine hundred ninety thousand, five hundred twenty-three".