2981729 has 4 divisors (see below), whose sum is σ = 2986176. Its totient is φ = 2977284.

The previous prime is 2981711. The next prime is 2981753. The reversal of 2981729 is 9271892.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2981729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 2981692 and 2981701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2981779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 989 + ... + 2634.

It is an arithmetic number, because the mean of its divisors is an integer number (746544).

2^2981729 is an apocalyptic number.

It is an amenable number.

2981729 is a deficient number, since it is larger than the sum of its proper divisors (4447).

2981729 is an equidigital number, since it uses as much as digits as its factorization.

2981729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4446.

The product of its digits is 18144, while the sum is 38.

The square root of 2981729 is about 1726.7683689482. The cubic root of 2981729 is about 143.9315679219.

The spelling of 2981729 in words is "two million, nine hundred eighty-one thousand, seven hundred twenty-nine".