2156939 has 2 divisors, whose sum is σ = 2156940. Its totient is φ = 2156938.

The previous prime is 2156897. The next prime is 2156993. The reversal of 2156939 is 9396512.

Together with next prime (2156993) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2156939 - 2⁸ = 2156683 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2²¹ + 1 + 5 + 6⁶ + 9⁴ + 3 + 9⁴ .

It is a junction number, because it is equal to n+sod(n) for n = 2156899 and 2156908.

It is not a weakly prime, because it can be changed into another prime (2156039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078469 + 1078470.

It is an arithmetic number, because the mean of its divisors is an integer number (1078470).

2^2156939 is an apocalyptic number.

2156939 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156939 is an equidigital number, since it uses as much as digits as its factorization.

2156939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14580, while the sum is 35.

The square root of 2156939 is about 1468.6521031204. The cubic root of 2156939 is about 129.2049902701.

The spelling of 2156939 in words is "two million, one hundred fifty-six thousand, nine hundred thirty-nine".