387989506 has 4 divisors (see below), whose sum is σ = 581984262. Its totient is φ = 193994752.

The previous prime is 387989477. The next prime is 387989509. The reversal of 387989506 is 605989783.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 303073281 + 84916225 = 17409^2 + 9215^2 .

It is a super-2 number, since 2×387989506² = 301071713532248072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (387989509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96997375 + ... + 96997378.

Almost surely, 2^387989506 is an apocalyptic number.

387989506 is a deficient number, since it is larger than the sum of its proper divisors (193994756).

387989506 is a wasteful number, since it uses less digits than its factorization.

387989506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193994755.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The square root of 387989506 is about 19697.4492257246. The cubic root of 387989506 is about 729.3567273690.

The spelling of 387989506 in words is "three hundred eighty-seven million, nine hundred eighty-nine thousand, five hundred six".