387770881 has 4 divisors (see below), whose sum is σ = 387996372. Its totient is φ = 387545392.

The previous prime is 387770863. The next prime is 387770893. The reversal of 387770881 is 188077783.

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

It can be written as a sum of positive squares in 2 ways, for example, as 246992656 + 140778225 = 15716^2 + 11865^2 .

It is a cyclic number.

It is not a de Polignac number, because 387770881 - 2¹⁷ = 387639809 is a prime.

It is a super-2 number, since 2×387770881² = 300732512303032322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387770681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110146 + ... + 113611.

It is an arithmetic number, because the mean of its divisors is an integer number (96999093).

Almost surely, 2^387770881 is an apocalyptic number.

It is an amenable number.

387770881 is a deficient number, since it is larger than the sum of its proper divisors (225491).

387770881 is a wasteful number, since it uses less digits than its factorization.

387770881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225490.

The product of its (nonzero) digits is 526848, while the sum is 49.

The square root of 387770881 is about 19691.8988673007. The cubic root of 387770881 is about 729.2197085652.

The spelling of 387770881 in words is "three hundred eighty-seven million, seven hundred seventy thousand, eight hundred eighty-one".