2129247 has 20 divisors (see below), whose sum is σ = 3225376. Its totient is φ = 1399680.

The previous prime is 2129227. The next prime is 2129261. The reversal of 2129247 is 7429212.

It is not a de Polignac number, because 2129247 - 2⁷ = 2129119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2129247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7722 + ... + 7992.

2^2129247 is an apocalyptic number.

2129247 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2129247 is a deficient number, since it is larger than the sum of its proper divisors (1096129).

2129247 is an equidigital number, since it uses as much as digits as its factorization.

2129247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 371 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 2129247 is about 1459.1939555796. The cubic root of 2129247 is about 128.6496714228.

The spelling of 2129247 in words is "two million, one hundred twenty-nine thousand, two hundred forty-seven".