2154947 has 4 divisors (see below), whose sum is σ = 2190336. Its totient is φ = 2119560.

The previous prime is 2154941. The next prime is 2154949. The reversal of 2154947 is 7494512.

It is a happy number.

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 2154947 - 2⁴ = 2154931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2154941) 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, 17603 + ... + 17724.

It is an arithmetic number, because the mean of its divisors is an integer number (547584).

2^2154947 is an apocalyptic number.

2154947 is a deficient number, since it is larger than the sum of its proper divisors (35389).

2154947 is an equidigital number, since it uses as much as digits as its factorization.

2154947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35388.

The product of its digits is 10080, while the sum is 32.

The square root of 2154947 is about 1467.9737736077. The cubic root of 2154947 is about 129.1652030820.

The spelling of 2154947 in words is "two million, one hundred fifty-four thousand, nine hundred forty-seven".