387129055 has 4 divisors (see below), whose sum is σ = 464554872. Its totient is φ = 309703240.

The previous prime is 387129053. The next prime is 387129079. The reversal of 387129055 is 550921783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 550921783 = 23 ⋅23953121.

It is not a de Polignac number, because 387129055 - 2¹ = 387129053 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 387128999 and 387129017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387129053) 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, 38712901 + ... + 38712910.

It is an arithmetic number, because the mean of its divisors is an integer number (116138718).

Almost surely, 2^387129055 is an apocalyptic number.

387129055 is a deficient number, since it is larger than the sum of its proper divisors (77425817).

387129055 is an equidigital number, since it uses as much as digits as its factorization.

387129055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77425816.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 387129055 is about 19675.5954166577. The cubic root of 387129055 is about 728.8171593166.

The spelling of 387129055 in words is "three hundred eighty-seven million, one hundred twenty-nine thousand, fifty-five".