8121739 has 2 divisors, whose sum is σ = 8121740. Its totient is φ = 8121738.

The previous prime is 8121727. The next prime is 8121749. The reversal of 8121739 is 9371218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8121739 - 2¹⁷ = 7990667 is a prime.

8121739 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8121739.

It is not a weakly prime, because it can be changed into another prime (8121709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060869 + 4060870.

It is an arithmetic number, because the mean of its divisors is an integer number (4060870).

Almost surely, 2^8121739 is an apocalyptic number.

8121739 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121739 is an equidigital number, since it uses as much as digits as its factorization.

8121739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 31.

The square root of 8121739 is about 2849.8664881008. The cubic root of 8121739 is about 201.0093887680.

The spelling of 8121739 in words is "eight million, one hundred twenty-one thousand, seven hundred thirty-nine".