387144977 has 4 divisors (see below), whose sum is σ = 387188916. Its totient is φ = 387101040.

The previous prime is 387144973. The next prime is 387145009. The reversal of 387144977 is 779441783.

It is a Cunningham number, because it is equal to 19676²+1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 274763776 + 112381201 = 16576^2 + 10601^2 .

It is a cyclic number.

It is not a de Polignac number, because 387144977 - 2² = 387144973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387144971) 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, 3674 + ... + 28067.

It is an arithmetic number, because the mean of its divisors is an integer number (96797229).

Almost surely, 2^387144977 is an apocalyptic number.

It is an amenable number.

387144977 is a deficient number, since it is larger than the sum of its proper divisors (43939).

387144977 is a wasteful number, since it uses less digits than its factorization.

387144977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43938.

The product of its digits is 1185408, while the sum is 50.

The square root of 387144977 is about 19676.0000254117. Note that the first 4 decimals coincide. The cubic root of 387144977 is about 728.8271508750.

The spelling of 387144977 in words is "three hundred eighty-seven million, one hundred forty-four thousand, nine hundred seventy-seven".