387442881 has 12 divisors (see below), whose sum is σ = 639588352. Its totient is φ = 221395896.

The previous prime is 387442877. The next prime is 387442931. The reversal of 387442881 is 188244783.

It is not a de Polignac number, because 387442881 - 2² = 387442877 is a prime.

It is a super-2 number, since 2×387442881² = 300223972075160322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387442831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3074881 + ... + 3075006.

Almost surely, 2^387442881 is an apocalyptic number.

It is an amenable number.

387442881 is a deficient number, since it is larger than the sum of its proper divisors (252145471).

387442881 is a wasteful number, since it uses less digits than its factorization.

387442881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6149900 (or 6149897 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 387442881 is about 19683.5688075105. The cubic root of 387442881 is about 729.0140445622.

The spelling of 387442881 in words is "three hundred eighty-seven million, four hundred forty-two thousand, eight hundred eighty-one".