2158747 has 8 divisors (see below), whose sum is σ = 2257920. Its totient is φ = 2061480.

The previous prime is 2158733. The next prime is 2158753. The reversal of 2158747 is 7478512.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2158747 - 2¹¹ = 2156699 is a prime.

It is a super-2 number, since 2×2158747² = 9320377220018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2158727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2154 + ... + 2992.

It is an arithmetic number, because the mean of its divisors is an integer number (282240).

2^2158747 is an apocalyptic number.

2158747 is a deficient number, since it is larger than the sum of its proper divisors (99173).

2158747 is an equidigital number, since it uses as much as digits as its factorization.

2158747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953.

The product of its digits is 15680, while the sum is 34.

The square root of 2158747 is about 1469.2675045750. The cubic root of 2158747 is about 129.2410811350.

The spelling of 2158747 in words is "two million, one hundred fifty-eight thousand, seven hundred forty-seven".