2158739 has 6 divisors (see below), whose sum is σ = 2360316. Its totient is φ = 1958060.

The previous prime is 2158733. The next prime is 2158753. The reversal of 2158739 is 9378512.

It is not a de Polignac number, because 2158739 - 2⁸ = 2158483 is a prime.

It is a d-powerful number, because it can be written as 2 + 1 + 5³ + 8⁷ + 7⁴ + 3¹⁰ + 9 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2158699 and 2158708.

It is not an unprimeable number, because it can be changed into a prime (2158733) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4652 + ... + 5094.

It is an arithmetic number, because the mean of its divisors is an integer number (393386).

2^2158739 is an apocalyptic number.

2158739 is a deficient number, since it is larger than the sum of its proper divisors (201577).

2158739 is an frugal number, since it uses more digits than its factorization.

2158739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897 (or 454 counting only the distinct ones).

The product of its digits is 15120, while the sum is 35.

The square root of 2158739 is about 1469.2647821274. The cubic root of 2158739 is about 129.2409214853.

The spelling of 2158739 in words is "two million, one hundred fifty-eight thousand, seven hundred thirty-nine".