2156949389 has 8 divisors (see below), whose sum is σ = 2470435968. Its totient is φ = 1844800560.

The previous prime is 2156949371. The next prime is 2156949391. The reversal of 2156949389 is 9839496512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156949389 is a prime.

It is a super-4 number, since 4×2156949389⁴ (a number of 38 digits) contains 4444 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156949349) 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 7 ways as a sum of consecutive naturals, for example, 330977 + ... + 337430.

It is an arithmetic number, because the mean of its divisors is an integer number (308804496).

Almost surely, 2^2156949389 is an apocalyptic number.

It is an amenable number.

2156949389 is a deficient number, since it is larger than the sum of its proper divisors (313486579).

2156949389 is an equidigital number, since it uses as much as digits as its factorization.

2156949389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668875.

The product of its digits is 4199040, while the sum is 56.

The square root of 2156949389 is about 46442.9692095585. The cubic root of 2156949389 is about 1292.0519771046.

The spelling of 2156949389 in words is "two billion, one hundred fifty-six million, nine hundred forty-nine thousand, three hundred eighty-nine".