388491 has 4 divisors (see below), whose sum is σ = 517992. Its totient is φ = 258992.

The previous prime is 388489. The next prime is 388499. The reversal of 388491 is 194883.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 388491 - 2¹ = 388489 is a prime.

It is a D-number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 388491.

It is not an unprimeable number, because it can be changed into a prime (388499) 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, 64746 + ... + 64751.

It is an arithmetic number, because the mean of its divisors is an integer number (129498).

2³⁸⁸⁴⁹¹ is an apocalyptic number.

388491 is a deficient number, since it is larger than the sum of its proper divisors (129501).

388491 is a wasteful number, since it uses less digits than its factorization.

388491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129500.

The product of its digits is 6912, while the sum is 33.

The square root of 388491 is about 623.2904619838. The cubic root of 388491 is about 72.9670834271.

The spelling of 388491 in words is "three hundred eighty-eight thousand, four hundred ninety-one".