2155047 has 4 divisors (see below), whose sum is σ = 2873400. Its totient is φ = 1436696.

The previous prime is 2155009. The next prime is 2155057. The reversal of 2155047 is 7405512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2155047 - 2⁸ = 2154791 is a prime.

It is an Ulam number.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155007) 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, 359172 + ... + 359177.

It is an arithmetic number, because the mean of its divisors is an integer number (718350).

2^2155047 is an apocalyptic number.

2155047 is a deficient number, since it is larger than the sum of its proper divisors (718353).

2155047 is an equidigital number, since it uses as much as digits as its factorization.

2155047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718352.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 2155047 is about 1468.0078337666. The cubic root of 2155047 is about 129.1672010152.

The spelling of 2155047 in words is "two million, one hundred fifty-five thousand, forty-seven".