381776879 has 4 divisors (see below), whose sum is σ = 416483880. Its totient is φ = 347069880.

The previous prime is 381776821. The next prime is 381776887. The reversal of 381776879 is 978677183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 978677183 = 11 ⋅88970653.

It is a cyclic number.

It is not a de Polignac number, because 381776879 - 2²⁰ = 380728303 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 (381776819) 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, 17353484 + ... + 17353505.

It is an arithmetic number, because the mean of its divisors is an integer number (104120970).

Almost surely, 2^381776879 is an apocalyptic number.

381776879 is a deficient number, since it is larger than the sum of its proper divisors (34707001).

381776879 is a wasteful number, since it uses less digits than its factorization.

381776879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34707000.

The product of its digits is 3556224, while the sum is 56.

The square root of 381776879 is about 19539.1115202304. Note that the first 3 decimals coincide. The cubic root of 381776879 is about 725.4428552361.

The spelling of 381776879 in words is "three hundred eighty-one million, seven hundred seventy-six thousand, eight hundred seventy-nine".