388891287 has 20 divisors (see below), whose sum is σ = 590467416. Its totient is φ = 255007440.

The previous prime is 388891267. The next prime is 388891313. The reversal of 388891287 is 782198883.

It is not a de Polignac number, because 388891287 - 2¹⁰ = 388890263 is a prime.

It is a super-3 number, since 3×388891287³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388891267) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34413 + ... + 44294.

Almost surely, 2^388891287 is an apocalyptic number.

388891287 is a deficient number, since it is larger than the sum of its proper divisors (201576129).

388891287 is an equidigital number, since it uses as much as digits as its factorization.

388891287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78780 (or 78771 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The square root of 388891287 is about 19720.3267467859. The cubic root of 388891287 is about 729.9213570125.

The spelling of 388891287 in words is "three hundred eighty-eight million, eight hundred ninety-one thousand, two hundred eighty-seven".