381238655 has 16 divisors (see below), whose sum is σ = 524103744. Its totient is φ = 260789760.

The previous prime is 381238621. The next prime is 381238657. The reversal of 381238655 is 556832183.

It is not a de Polignac number, because 381238655 - 2¹⁴ = 381222271 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 (381238657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1799 + ... + 27671.

It is an arithmetic number, because the mean of its divisors is an integer number (32756484).

Almost surely, 2^381238655 is an apocalyptic number.

381238655 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

381238655 is a deficient number, since it is larger than the sum of its proper divisors (142865089).

381238655 is a wasteful number, since it uses less digits than its factorization.

381238655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26306.

The product of its digits is 172800, while the sum is 41.

The square root of 381238655 is about 19525.3336719248. Note that the first 3 decimals coincide. The cubic root of 381238655 is about 725.1017883244.

The spelling of 381238655 in words is "three hundred eighty-one million, two hundred thirty-eight thousand, six hundred fifty-five".