381478779 has 12 divisors (see below), whose sum is σ = 601118232. Its totient is φ = 231199200.

The previous prime is 381478763. The next prime is 381478807. The reversal of 381478779 is 977874183.

It is not a de Polignac number, because 381478779 - 2⁴ = 381478763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381478709) 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, 1926562 + ... + 1926759.

It is an arithmetic number, because the mean of its divisors is an integer number (50093186).

Almost surely, 2^381478779 is an apocalyptic number.

381478779 is a deficient number, since it is larger than the sum of its proper divisors (219639453).

381478779 is a wasteful number, since it uses less digits than its factorization.

381478779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3853338 (or 3853335 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The square root of 381478779 is about 19531.4817410252. The cubic root of 381478779 is about 725.2539920223.

The spelling of 381478779 in words is "three hundred eighty-one million, four hundred seventy-eight thousand, seven hundred seventy-nine".