384977221 has 4 divisors (see below), whose sum is σ = 405239200. Its totient is φ = 364715244.

The previous prime is 384977207. The next prime is 384977273. The reversal of 384977221 is 122779483.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122779483 = 367 ⋅334549.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-384977221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384977921) 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, 10130961 + ... + 10130998.

It is an arithmetic number, because the mean of its divisors is an integer number (101309800).

Almost surely, 2^384977221 is an apocalyptic number.

It is an amenable number.

384977221 is a deficient number, since it is larger than the sum of its proper divisors (20261979).

384977221 is a wasteful number, since it uses less digits than its factorization.

384977221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20261978.

The product of its digits is 169344, while the sum is 43.

The square root of 384977221 is about 19620.8363990937. The cubic root of 384977221 is about 727.4642872059.

The spelling of 384977221 in words is "three hundred eighty-four million, nine hundred seventy-seven thousand, two hundred twenty-one".