387740881 has 4 divisors (see below), whose sum is σ = 422990064. Its totient is φ = 352491700.

The previous prime is 387740867. The next prime is 387740893. The reversal of 387740881 is 188047783.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 387740881 - 2⁵ = 387740849 is a prime.

It is a super-3 number, since 3×387740881³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387740851) 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, 17624575 + ... + 17624596.

It is an arithmetic number, because the mean of its divisors is an integer number (105747516).

Almost surely, 2^387740881 is an apocalyptic number.

It is an amenable number.

387740881 is a deficient number, since it is larger than the sum of its proper divisors (35249183).

387740881 is a wasteful number, since it uses less digits than its factorization.

387740881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35249182.

The product of its (nonzero) digits is 301056, while the sum is 46.

The square root of 387740881 is about 19691.1371180031. The cubic root of 387740881 is about 729.2009026530.

The spelling of 387740881 in words is "three hundred eighty-seven million, seven hundred forty thousand, eight hundred eighty-one".