2138155047 has 24 divisors (see below), whose sum is σ = 3531854976. Its totient is φ = 1221040656.

The previous prime is 2138155037. The next prime is 2138155069. The reversal of 2138155047 is 7405518312.

2138155047 is a `hidden beast` number, since 2 + 138 + 15 + 504 + 7 = 666.

It is not a de Polignac number, because 2138155047 - 2¹⁴ = 2138138663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138155037) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100348 + ... + 119774.

It is an arithmetic number, because the mean of its divisors is an integer number (147160624).

Almost surely, 2^2138155047 is an apocalyptic number.

2138155047 is a deficient number, since it is larger than the sum of its proper divisors (1393699929).

2138155047 is a wasteful number, since it uses less digits than its factorization.

2138155047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21187 (or 21184 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 2138155047 is about 46240.1886566221. The cubic root of 2138155047 is about 1288.2883066572.

The spelling of 2138155047 in words is "two billion, one hundred thirty-eight million, one hundred fifty-five thousand, forty-seven".