2156047 has 4 divisors (see below), whose sum is σ = 2177496. Its totient is φ = 2134600.

The previous prime is 2156041. The next prime is 2156053. The reversal of 2156047 is 7406512.

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

It is an interprime number because it is at equal distance from previous prime (2156041) and next prime (2156053).

It is a cyclic number.

It is not a de Polignac number, because 2156047 - 2³ = 2156039 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 (2156041) 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, 10573 + ... + 10774.

It is an arithmetic number, because the mean of its divisors is an integer number (544374).

2^2156047 is an apocalyptic number.

2156047 is a deficient number, since it is larger than the sum of its proper divisors (21449).

2156047 is a wasteful number, since it uses less digits than its factorization.

2156047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21448.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 2156047 is about 1468.3483919016. The cubic root of 2156047 is about 129.1871769488.

The spelling of 2156047 in words is "two million, one hundred fifty-six thousand, forty-seven".